A comprehensive collection of topical evaluation activities, guiding questions, and authentic Uganda National Examinations Board (UNEB PLE 2018–2024 & National Mock) past exam questions, complete with official examiners' marking schemes and candidate pitfall notes.
Question 1 • Section A [1 Mark]
P.6
The Respiratory System
📌 UNEB PLE 2024, Question 3
State any one function of the diaphragm during the process of breathing.
✅Official UNEB Marking Guide / Expected Answer:
The diaphragm changes the volume of the chest cavity to facilitate respiration (or: it contracts and relaxes to allow air in and out of the lungs).
Question 2 • Section A [1 Mark]
P.6
Classification of Animals
📌 UNEB PLE 2024, Question 5
The diagram below shows an animal in the group of invertebrates. (Snail diagram) Name the animal shown.
✅Official UNEB Marking Guide / Expected Answer:
A snail (or Garden snail / Water snail).
Question 3 • Section A [1 Mark]
P.6
Alcohol, Smoking and Drugs
📌 UNEB PLE 2024, Question 14
State any one way in which fermentation is important in our daily life.
✅Official UNEB Marking Guide / Expected Answer:
Fermentation is used in making local brews / alcohol, production of biogas, making yoghurt, cheese, and ghee, or bread baking.
Question 4 • Section A [1 Mark]
P.6
Classification of Animals
📌 Kolfram National Mock Championship 2024, Question 1
Name the part of an insect used for balancing during flight.
✅Official UNEB Marking Guide / Expected Answer:
Halteres.
Question 5 • Section A [1 Mark]
P.6
Sound Energy
📌 Kolfram National Mock Championship 2024, Question 11
Which part of the human body is affected by Otalgia?
✅Official UNEB Marking Guide / Expected Answer:
Human ears (specifically middle ear pain/earaches).
Question 6 • Section A [1 Mark]
P.6
Keeping Cattle
📌 National Pre-PLE Mock Championship 2025, Question 1
Name the part of a cow that changes the color when a cow is on heat.
✅Official UNEB Marking Guide / Expected Answer:
The vulva (it becomes swollen and red).
SECTION B: STRUCTURED QUESTIONS (4 Marks Each)
Question 7 • Section B [4 Marks]
P.6
Sound Energy
📌 UNEB PLE 2024, Question 49
(a) Mention any one example of musical instruments in each of the groups below:
(i) String instrument
(ii) Percussion instrument
(b) Name any two methods of storing sound.
✅Official UNEB Marking Guide / Expected Answer:
(a) (i) Guitar, Lyre, Bow harp ("Adungu"), Violin, or Banjo.
(ii) Drum, Long drum, Bell, Xylophone, or Thumb piano.
(b) Mechanical method (e.g., physical grooves), Magnetic method (tapes), Electromagnetic method, or Digital recording.
Question 8 • Section B [4 Marks]
P.6
Classification of Animals
📌 UNEB PLE 2024, Question 50
(a) State the name of insects that live and work together.
(b) Give any one way in which insects are useful to people.
(c) State any two human activities that are dangerous to insects in the environment.
✅Official UNEB Marking Guide / Expected Answer:
(a) Social insects.
(b) Some insects are eaten as food (grasshoppers), some pollinate crops, or some provide honey and wax (honeybees).
(c) Any two of: Bush burning, Deforestation, Spraying chemical pesticides, or Swarm/wetland drainage.
Question 9 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Name two methods of obtaining clean water for washing at home.
✅Official UNEB Marking Guide / Expected Answer:
Filtration
Decantation
Question 10 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
In which method of making water clean do you first allow the impurities to settle at the bottom of a container?
✅Official UNEB Marking Guide / Expected Answer:
Decantation (or Sedimentation).
Question 11 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
How does chlorine make water safe for drinking?
✅Official UNEB Marking Guide / Expected Answer:
Chlorine kills germs / pathogens in the water.
Question 12 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is water obtained by the distillation method not recommended for drinking at home?
✅Official UNEB Marking Guide / Expected Answer:
Distilled water lacks essential mineral salts required by the human body to stay healthy.
Question 13 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
How does boiling make water safe for drinking?
✅Official UNEB Marking Guide / Expected Answer:
The high temperature (100°C) denatures and kills all disease-causing germs in the water.
Question 14 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Mention one way in which you can prevent some clothes from staining others during washing.
✅Official UNEB Marking Guide / Expected Answer:
Sorting the clothes by color (separating whites from bleeding colored clothes) before washing.
Question 15 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Give any two examples of water impurities.
✅Official UNEB Marking Guide / Expected Answer:
Any two of: Silt/mud, human/animal wastes, agro-chemicals, industrial wastes, or rust.
Question 16 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State any one danger of hanging colored clothes under direct sunshine for a long time to dry.
✅Official UNEB Marking Guide / Expected Answer:
Direct solar heat and ultraviolet (UV) rays cause the colors/dyes of the fabrics to fade.
Question 17 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State any two ways in which washing clothes is important to human health.
✅Official UNEB Marking Guide / Expected Answer:
Any two of:
Prevents the spread of skin diseases (like scabies and ringworms).
Prevents the breeding of ectoparasites (like body lice, bedbugs, and mites).
Eliminates bad body odors.
Question 18 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State the reason why woolen clothes should be dried flat without wringing (twisting).
✅Official UNEB Marking Guide / Expected Answer:
Twisting or wringing wool stretches, distorts, and breaks the delicate protein fibers, ruining the permanent shape of the garment.
Question 19 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State any one way in which the ironing of clothes is useful when cleaning clothes.
✅Official UNEB Marking Guide / Expected Answer:
Ironing removes wrinkles/creases to make them look smart, and the heat kills any remaining germs and parasite eggs hidden in the seams.
Question 20 • Section A [1 Mark]
P.6
Science at Home and in Our Community
📌 UNEB PLE 2023, Question 14
State the scientific function of soap in cleaning clothes.
✅Official UNEB Marking Guide / Expected Answer:
Soap emulsifies grease/oil, lifts dirt, or weakens stains on fabrics.
Question 21 • Section B [4 Marks]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
The diagram below shows a simple setup of making water clean. Study and use it to answer the questions that follow:
(b) Apart from coarse stones, name any two other local materials that can be placed in container T.
(c) Why should the clean water obtained in container S be boiled before drinking?
✅Official UNEB Marking Guide / Expected Answer:
(a) Filtration.
(b) Any two of: Fine sand, coarse sand, charcoal paste, pebbles, cotton wool, or clean cloth.
(c) It is clean but not safe because it still contains germs (filtration only removes physical dirt, not microscopic bacteria). It must be boiled to kill those germs.
Question 22 • Section B [4 Marks]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
(a) Name one plant material from which local salt can be prepared at home.
(b) State the physical method used to prepare local salt from ash.
(c) Give any two ways in which the local salt prepared at home is useful to people.
✅Official UNEB Marking Guide / Expected Answer:
(a) Dry banana peelings (or dry bean plant leaves).
(b) Filtration (followed by evaporation/crystallization to get solid crystals).
(c) Any two of:
Used to soften/tenderize food (like dry beans) during cooking.
Used as a food preservative for meat and fish.
Used as a pesticide.
Used as local medicine to cure minor stomach upsets.
Question 23 • Section B [4 Marks]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
The diagram below shows a simple water purification system. Study and use it to answer the questions that follow:
Swampy water ──► Filtered ──► Point W ──► Stored in the jerrycan
(a) Name any one activity that can be done to water at Point W.
(b) Why is swampy water filtered before being taken to Point W?
(c) State the importance of passing water through Point W.
(d) Mention any one other activity that can be done to swampy water before being taken to Point W to make it clear.
✅Official UNEB Marking Guide / Expected Answer:
(a) Boiling (or adding water treatment chemicals/chlorinating).
(b) To remove large physical suspended dirt and impurities.
(c) To kill disease-causing germs to make the water safe for drinking.
(d) Decantation.
Question 24 • Section B [2 Marks]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State the importance of the following steps in cleaning clothes at home:
(i) Sorting
(ii) Soaking
✅Official UNEB Marking Guide / Expected Answer:
(i) Sorting: Separates clothes by color to prevent staining, and by texture/dirtiness to protect delicate fabrics.
(ii) Soaking: Softens and dissolves stubborn dried dirt and stains, making scrub-washing easier.
Question 25 • Section B [2 Marks]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Question 26 • Section B [3 Marks]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
(a) What is meant by the term silting?
(b) State the major cause of silting in water bodies.
(c) Apart from killing fish, give one way in which silting affects aquatic life.
✅Official UNEB Marking Guide / Expected Answer:
(a) Silting is the deposition and accumulation of eroded soil particles into water bodies.
(b) Soil erosion (triggered by cultivating or overgrazing near river banks).
(c) Any one of:
Blocks the oxygen supply to aquatic animals.
Destroys aquatic habitats and breeding grounds.
Exposes fish to predators due to cloudy/turbid water.
Question 27 • Section B [4 Marks]
P.6
Science at Home and in Our Community
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Match the laundry terms in Part A with their correct scientific meanings in Part B:
Sorting
Wringing
Rinsing
Soaking
✅Official UNEB Marking Guide / Expected Answer:
Sorting: Grouping clothes before washing or soaking based on color and texture.
Wringing: Squeezing clothes to remove excess water.
Rinsing: Putting clothes in clean water to completely remove soapy residues.
Soaking: Putting dirty clothes in soapy water to soften dirt before washing.
TOPIC 10: ACCIDENTS AND FIRST AID
Question 28 • Section B [4 Marks]
P.6
Science at Home and in Our Community
📌 Kolfram National Mock Championship 2024, Question 46
(a) Give the meaning of the term siltation (silting).
(b) Identify the major cause of siltation.
(c) State any two effects of siltation in water bodies.
✅Official UNEB Marking Guide / Expected Answer:
(a) Siltation is the deposition and accumulation of eroded soil particles into water bodies.
(b) Soil erosion.
(c) Any two of:
It causes flooding in local compounds.
It blocks food and light for aquatic life.
It reduces the oxygen supply to fish, leading to death.
Question 29 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
How is a burn different from a scald?
✅Official UNEB Marking Guide / Expected Answer:
A burn is a skin injury caused by dry heat (hot metals, flames, acid, or electricity), whereas a scald is caused by wet/moist heat (boiling water, steam, hot porridge, or soup).
Question 30 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Give any one reason why a burnt or scalded part of the skin is dipped in cold water immediately.
✅Official UNEB Marking Guide / Expected Answer:
Any one of:
To cool down the temperature around the skin tissue.
To reduce swelling and relieve severe pain.
To prevent the formation of blisters and further deep cell damage.
Question 31 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is it not advisable to burst blisters on a burnt part of the skin?
✅Official UNEB Marking Guide / Expected Answer:
Blisters act as a protective skin barrier; bursting them creates an open wound that exposes raw tissue to bacteria, causing infections.
Question 32 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
How is tepid sponging useful to a casualty with high fever?
✅Official UNEB Marking Guide / Expected Answer:
It cools down the high body temperature and opens sweat pores, helping release excess body heat to prevent convulsions.
Question 33 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
What kind of water is recommended for use during tepid sponging, and why should very cold water be avoided?
✅Official UNEB Marking Guide / Expected Answer:
Lukewarm water is used. Very cold water must be avoided because it causes shivering, which reflexively increases internal body heat production.
Question 34 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is it not advisable to give a convulsing or fainted person food to eat or water to drink?
✅Official UNEB Marking Guide / Expected Answer:
It can cause the food or drink to enter the windpipe (trachea) instead of the esophagus, leading to choking and sudden death.
Question 35 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Give a reason why a hard object (wrapped in a clean cloth) should be put in the mouth of a convulsing victim.
✅Official UNEB Marking Guide / Expected Answer:
To prevent the casualty from biting their tongue during violent, uncontrolled muscle shaking.
Question 36 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is it raised legs that are required when giving first aid to a person who has fainted?
✅Official UNEB Marking Guide / Expected Answer:
Elevating the legs uses gravity to allow the easy flow of oxygenated blood from the lower body back to the brain to restore consciousness.
Question 37 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Give one reason why a person who has fainted should be placed in a cool, open, and well-ventilated space.
✅Official UNEB Marking Guide / Expected Answer:
To ensure they get plenty of fresh air and oxygen to aid quick recovery.
Question 38 • Section A [1 Mark]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why does prolonged hunger sometimes lead to fainting?
✅Official UNEB Marking Guide / Expected Answer:
Prolonged hunger drops blood glucose levels, which reduces the supply of energy and oxygen reaching brain cells.
Question 39 • Section B [4 Marks]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
A child suddenly removed the cover of a saucepan full of boiling water. One of the child's arms was injured.
(a) Name the exact substance that injured the child.
(b) What kind of accident did the child get?
(c) State the first aid you would immediately give to the child.
(d) Give any one way in which the child would avoid the accident mentioned in (b) above.
✅Official UNEB Marking Guide / Expected Answer:
(a) Steam (or hot water droplets).
(b) A scald.
(c) Immediately dip/place the injured arm in clean cold water.
(d) Any one of: Use insulators/holder cloths to remove covers, avoid playing near cooking stoves, or cook from a raised place.
Question 40 • Section B [4 Marks]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
(a) State the difference between drowning and near drowning.
(b) Give any two common causes of near drowning.
(c) State any one way you can help save a near-drowned casualty.
✅Official UNEB Marking Guide / Expected Answer:
(a) Drowning is dying due to lungs being filled with water, whereas near drowning is a condition where lungs are filled with water and breathing fails, but the casualty is not yet dead.
(b) Any two of: Inability to swim, capsizing of boats in a storm, floods, or getting a muscle cramp while in deep water.
(c) Pull them out of the water immediately and apply mouth-to-mouth resuscitation (Kiss of life) followed by chest compressions (CPR).
Question 41 • Section B [4 Marks]
P.6
Accidents and First Aid
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
(a) Why should a first aider never induce vomiting in a casualty who has swallowed paraffin or kerosene?
(b) What first aid should be given to a paraffin poisoning victim?
(c) How should a first aider manage a non-corrosive poisoning casualty?
✅Official UNEB Marking Guide / Expected Answer:
(a) Paraffin is a corrosive poison. Inducing vomiting will cause the chemical to burn the throat and esophagus a second time as it flows back up, or it can be inhaled into the lungs.
(b) Give them plenty of cold milk to coat the stomach lining and dilute the chemical, then rush them to a hospital immediately.
(c) Induce vomiting to remove the toxic substance from the stomach and give them milk to dilute the toxic concentrations.
💡 Would you like me to compile these exact evaluation questions into a ready-to-print, beautifully formatted PDF worksheets file for your classroom tests?
Question 42 • Section B [4 Marks]
P.6
Accidents and First Aid
📌 National Primary Science Evaluation Series 2025, Section B Question
(a) Name the kind of water recommended to be used when tepid sponging a casualty of high fever.
(b) State the scientific reason why the water mentioned in (a) is used instead of very cold water.
(c) Mention any two signs of dysentery in humans.
✅Official UNEB Marking Guide / Expected Answer:
(a) Lukewarm water.
(b) Lukewarm water opens up sweat pores to let out excess body heat, whereas very cold water causes shivering (which reflexively increases internal body heat production).
(c) Any two of: Passing out stools with blood and mucus, severe abdominal/stomach pain, high fever, or vomiting.
📝 Would you like me to compile these exact exam questions into a printable PDF assessment worksheet for your class's end-of-term revision?
Question 43 • Section A [1 Mark]
P.6
Sanitation
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State the scientific function of the screen (wire mesh) on top of the vent pipe of a VIP latrine.
✅Official UNEB Marking Guide / Expected Answer:
To trap houseflies and blowflies inside the vent pipe. They are attracted to the light at the top of the pipe, get trapped by the screen, and eventually starve to death, breaking their breeding cycle.
Question 44 • Section A [1 Mark]
P.6
Sanitation
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is the drop hole of a VIP latrine left open without a lid at all times?
✅Official UNEB Marking Guide / Expected Answer:
To allow fresh air to flow freely down into the pit and push smelly gases up and out through the vent pipe.
Question 45 • Section A [1 Mark]
P.6
Sanitation
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
How does the Ecosan latrine promote agricultural productivity?
✅Official UNEB Marking Guide / Expected Answer:
It separates and dehydrates feces using ash, converting human waste into safe, organic manure (fertilizer) to improve soil fertility in gardens.
Question 46 • Section A [1 Mark]
P.6
Sanitation
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State the function of the U-trap in a water closet (flush toilet).
✅Official UNEB Marking Guide / Expected Answer:
The U-trap holds a small pool of clean water which acts as a liquid barrier to prevent bad smells and foul sewer gases from entering the toilet room.
Question 47 • Section A [1 Mark]
P.6
Sanitation
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is it dangerous to pour highly acidic substances or strong chemical insecticides into a pit latrine?
✅Official UNEB Marking Guide / Expected Answer:
Strong acids and insecticides kill the useful putrefying bacteria responsible for decomposing organic waste, which would cause the latrine to fill up very quickly.
(a) What scientific name is given to the disease-spreading pathway shown above?
(b) Give any two examples of communicable diarrhoeal diseases spread through this pathway.
(c) State any one physical activity done at home to block vectors from accessing Food.
✅Official UNEB Marking Guide / Expected Answer:
(a) The 4Fs / 5Fs Germ Path.
(b) Any two of: Cholera, Typhoid fever, Dysentery, or Diarrhoea.
(c) Covering all cooked food with clean lids (or keeping food in a sterile food mesh cabinet).
Question 51 • Section B [4 Marks]
P.6
Sanitation
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
(a) What physical condition results when a patient passes out watery stools many times a day?
(b) State two physical signs of the condition mentioned in (a) above.
(c) What first aid treatment is given to a victim of the condition in (a) to restore balance?
✅Official UNEB Marking Guide / Expected Answer:
(a) Dehydration (loss of water and essential mineral salts).
(b) Any two of: Sunken eyes, dry lips, pale skin that does not snap back when pinched, or extreme body weakness.
(c) Administering Oral Rehydration Solution (ORS) or extra fluids like coconut water.
Question 52 • Section B [4 Marks]
P.6
Sanitation
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
(a) Give the difference between an Ordinary Pit Latrine and a VIP Latrine in terms of structural coverings.
(b) What material is used in an Ecosan latrine to dry human waste, and what is its role?
(c) State one major maintenance rule for a Water Closet (Flush Toilet) bowl.
✅Official UNEB Marking Guide / Expected Answer:
(a) An ordinary pit latrine requires a tight-fitting lid over its drop hole, whereas a VIP latrine must be left open without a lid at all times.
(b) Wood ash (or soil/lime) is sprinkled over the feces. Its role is to dehydrate the waste, neutralize smells, and raise pH to destroy pathogens.
(c) Never throw hard materials (like stones, pads, or newspapers) into the bowl to prevent blockage.
TOPIC 12: THE REPRODUCTIVE SYSTEM
Question 53 • Section A [1 Mark]
P.6
The Reproductive System
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State the exact part of the female reproductive system where fertilization takes place.
✅Official UNEB Marking Guide / Expected Answer:
Oviduct / Fallopian tube.
PLE
💡
Candidate Pitfall / Examiner Note: Never write "the uterus" or "the womb." The uterus is where implantation occurs, not fertilization.
Question 54 • Section A [1 Mark]
P.6
The Reproductive System
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
How is the function of the anthers in a flower similar to that of the testes in a human male?
✅Official UNEB Marking Guide / Expected Answer:
Both organs are responsible for producing male gametes (anthers produce pollen grains, while testes produce sperm cells).
Question 55 • Section A [1 Mark]
P.6
The Reproductive System
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State any one primary sex characteristic in human females.
Candidate Pitfall / Examiner Note: "Abstaining from sex" is a practice, not a psychological life skill.
Question 57 • Section A [1 Mark]
P.6
The Reproductive System
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Why is a husband and his wife advised to go for treatment together when they contract gonorrhoea?
✅Official UNEB Marking Guide / Expected Answer:
To prevent re-infection between the partners.
Question 58 • Section A [1 Mark]
P.6
The Reproductive System
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
State the biological function of the ciliated cells lining the fallopian tubes.
✅Official UNEB Marking Guide / Expected Answer:
To sweep/move the passive, non-motile ovum toward the uterus.
Question 59 • Section A [1 Mark]
P.6
The Reproductive System
📌 UNEB PLE 2024, Question 34
Give any one example of an emotional change in adolescents.
✅Official UNEB Marking Guide / Expected Answer:
They develop mood swings, get more interested in members of the opposite sex, get disappointed easily, become rebellious, form peer groups, or become ambitious.
Question 60 • Section B [4 Marks]
P.6
The Reproductive System
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
(a) State the difference between identical twins and fraternal twins in terms of fertilization.
(b) State any two physical characteristics unique to identical twins.
✅Official UNEB Marking Guide / Expected Answer:
(a) Identical twins are formed from one ovum fertilized by one sperm cell which later splits, while fraternal twins are formed from two separate ova fertilized by two different sperm cells.
(b) 1. They are always of the same sex.
2. They look exactly alike (have identical features).
Question 61 • Section B [4 Marks]
P.6
The Reproductive System
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
(a) Name the male sex hormone responsible for secondary sex changes during puberty.
(b) Mention two secondary physical changes that occur only in boys during puberty.
(c) Name any one secondary physical change that is common to both boys and girls during puberty.
✅Official UNEB Marking Guide / Expected Answer:
(a) Testosterone.
(b) Any two of: Deepening/breaking of the voice, growth of facial hair (beards), broadening of shoulders/chest, or initiation of sperm production.
(c) Any one of: Growth of pubic hair, growth of hair under the armpits, or pimples on the face.
Question 62 • Section B [4 Marks]
P.6
The Reproductive System
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
Match the reproductive structures in Part A with their correct physiological functions in Part B:
Epididymis
Scrotum
Cervix
Vas deferens
✅Official UNEB Marking Guide / Expected Answer:
Epididymis: Stores sperm cells to mature.
Scrotum: Maintains a cooler temperature for sperm production.
Cervix: Protects the developing fetus from physical damage.
Vas deferens: Carries mature sperm cells to the urethra.
Question 63 • Section B [4 Marks]
P.6
The Reproductive System
📌 P.6 Science Coursebook • Term 3 Evaluation Activity
(a) State the difference between vasectomy and tubal ligation as methods of family planning.
(b) Why is the use of condoms highly recommended during family planning compared to other methods?
(c) Name one natural family planning method.
✅Official UNEB Marking Guide / Expected Answer:
(a) Vasectomy is a permanent surgical method done on men (cutting the vas deferens), whereas tubal ligation is done on women (cutting the fallopian tubes).
(b) Condoms are the only birth control method that also protects against the transmission of STDs/HIV.
(c) Any one of: Abstinence, calendar/rhythm method, withdrawal, or prolonged breastfeeding.
🎨 We have now extracted the complete Evaluation Questions for P.6 Term 3! Would you like me to turn these questions into an interactive class game or a beautiful PDF exam paper that you can print for your pupils?
Question 64 • Section B [4 Marks]
P.6
The Reproductive System
📌 National Pre-PLE Mock Championship 2025, Question 55
(a) Write down any two disorders that affect the male reproductive system.
(b) State any one advantage of child spacing to a mother in a family.
(c) Give any one reason why females are highly affected by HIV/AIDS during intercourse.
✅Official UNEB Marking Guide / Expected Answer:
(a) Any two of: Prostate cancer, Prostate enlargement, Testicular cancer, Hydrocele, or Infertility.
(b) Allows the mother to regain her physical health/strength before the next pregnancy (or allows her time to nurse the newborn child properly).
(c) Any one of:
The vagina has a larger mucosal surface area exposed to seminal fluid.
Seminal fluid remains inside the vagina for a longer duration of time.
The delicate vaginal lining is prone to micro-tears during intercourse.
Question 65 • Section A [1 Mark]
P.5
Types of Changes in the Environment
📌 P.5 Science Coursebook (Term 3)
Name any one living thing that undergoes moulting in the environment.
✅Official UNEB Marking Guide / Expected Answer:
Snake OR Cockroach OR Grasshopper OR Crab OR Spider.
💡
Candidate Pitfall / Examiner Note: Accept any reptile or arthropod that sheds its outer skin/cuticle for growth.
Question 66 • Section A [1 Mark]
P.5
Types of Changes in the Environment
📌 P.5 Science Coursebook (Term 3)
Why is the burning of dry paper classified as a chemical change?
✅Official UNEB Marking Guide / Expected Answer:
Because it is irreversible AND forms completely new substances (charcoal, ash, and carbon dioxide).
💡
Candidate Pitfall / Examiner Note: Candidate must emphasize that a new substance is formed or that it cannot be turned back into paper.
Question 67 • Section A [1 Mark]
P.5
Types of Changes in the Environment
📌 P.5 Science Coursebook (Term 3)
State the role of anhydrous calcium chloride in the laboratory investigation of rusting.
✅Official UNEB Marking Guide / Expected Answer:
To absorb all moisture/water vapour from the air inside the test tube (keeps the air dry).
💡
Candidate Pitfall / Examiner Note: Keyword is 'absorbs moisture' or 'dries the air'.
Question 68 • Section A [1 Mark]
P.5
Types of Changes in the Environment
📌 UNEB PLE Science Past Papers
Give any one danger of rusting to a school farmer's tools.
✅Official UNEB Marking Guide / Expected Answer:
It makes sharp cutting tools blunt OR weakens hoes/pangas OR causes tools to break easily.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for any mechanical damage or blunting of tools.
Question 69 • Section A [1 Mark]
P.5
Types of Changes in the Environment
📌 UNEB PLE Science Past Papers
What scientific term describes the direct change of a solid into a gas without melting into a liquid?
✅Official UNEB Marking Guide / Expected Answer:
Sublimation.
💡
Candidate Pitfall / Examiner Note: Check spelling of 'Sublimation'.
Question 70 • Section A [1 Mark]
P.5
Types of Changes in the Environment
📌 P.5 Science Coursebook (Term 3)
How does painting an iron gate prevent it from rusting?
✅Official UNEB Marking Guide / Expected Answer:
Painting covers the iron surface, preventing oxygen and moisture from coming into direct contact with the iron.
💡
Candidate Pitfall / Examiner Note: Must mention cutting off contact with oxygen and moisture.
Question 71 • Section B [4 Marks]
P.5
Types of Changes in the Environment
📌 P.5 Science Coursebook (Term 3)
Study the experimental setups below showing nails left in four test tubes for five days:
(a) In which test tube did the nail rust fastest? (1 mark)
(b) Why didn't the nail in Test-Tube B (boiled water + oil) rust? (1 mark)
(c) What was the purpose of Test-Tube C containing anhydrous calcium chloride? (1 mark)
(d) State the two environmental conditions necessary for iron to rust. (1 mark)
✅Official UNEB Marking Guide / Expected Answer:
(a) Test-Tube D (Salty water)
(b) Oxygen was absent (driven out by boiling and blocked by the oil layer)
(c) To keep the air completely dry by absorbing moisture
(d) Oxygen and Moisture (water)
💡
Candidate Pitfall / Examiner Note: Candidate must correctly identify the missing factor in each test tube.
Question 72 • Section B [4 Marks]
P.5
Types of Changes in the Environment
📌 UNEB PLE Science Past Papers
(a) State the difference between a physical change and a biological change. (1 mark)
(b) Give any two examples of physical changes involving heat gain. (2 marks)
(c) Name the physical process that occurs when morning dew turns into water vapour as the sun rises. (1 mark)
✅Official UNEB Marking Guide / Expected Answer:
(a) A physical change does not take place in living things and is reversible, whereas a biological change takes place exclusively in living organisms and is irreversible.
(b) (i) Melting (ii) Evaporation / Boiling
(c) Evaporation
💡
Candidate Pitfall / Examiner Note: Clear distinction in reversibility and living vs non-living matter.
Question 73 • Section B [4 Marks]
P.5
Types of Changes in the Environment
📌 P.5 Science Coursebook (Term 3)
Human activities bring about changes in the environment:
(a) Define the term afforestation. (1 mark)
(b) Give any two reasons why people cut down trees on a large scale (deforestation). (2 marks)
(c) State one way in which cutting down trees leads to severe environmental flooding. (1 mark)
✅Official UNEB Marking Guide / Expected Answer:
(a) Afforestation is the massive planting of trees in an area where there have never been trees before.
(b) (i) To get land for farming and settlement (ii) To get wood fuel (firewood and charcoal) and timber.
(c) Tree roots that absorb excess rainwater are destroyed, and bare soil easily allows rapid surface runoff into rivers and lakes.
💡
Candidate Pitfall / Examiner Note: Mark strictly on environmental cause-and-effect.
Question 74 • Section B [4 Marks]
P.5
Types of Changes in the Environment
📌 UNEB PLE Science Past Papers
A Primary 5 pupil heated a tin can with water, sealed it tightly, and poured cold water on it.
(a) What happened to the tin can? (1 mark)
(b) Explain why that happened to the can. (2 marks)
(c) Which physical state transition occurred inside the can? (1 mark)
✅Official UNEB Marking Guide / Expected Answer:
(a) The tin can crushed / collapsed inward.
(b) Cold water condensed the steam inside into liquid water, creating a partial vacuum (low air pressure) inside. The higher atmospheric air pressure outside crushed the can inward.
(c) Condensation (gas/steam turning into liquid water).
💡
Candidate Pitfall / Examiner Note: A classic 4-mark PLE question.
Question 75 • Section A [1 Mark]
P.5
Keeping Goats, Sheep, and Pigs
📌 P.5 Science Coursebook (Term 3)
Name the female parent in goat farming.
✅Official UNEB Marking Guide / Expected Answer:
Doe (or Nanny goat).
💡
Candidate Pitfall / Examiner Note: Accept either Doe or Nanny goat.
Question 76 • Section A [1 Mark]
P.5
Keeping Goats, Sheep, and Pigs
📌 P.5 Science Coursebook (Term 3)
State any one advantage of castrating male piglets not intended for breeding.
✅Official UNEB Marking Guide / Expected Answer:
It prevents indiscriminate breeding OR promotes faster growth/fattening OR removes boar taint from pork OR makes them docile.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for any correct management or meat-quality reason.
Question 77 • Section A [1 Mark]
P.5
Keeping Goats, Sheep, and Pigs
📌 UNEB PLE Science Past Papers
Why is the floor of a modern pigsty built with a gentle slope towards the drainage channel?
✅Official UNEB Marking Guide / Expected Answer:
To allow easy and rapid drainage of urine and wash water, keeping the pen dry and hygienic.
💡
Candidate Pitfall / Examiner Note: Must mention drainage or keeping the sty dry.
Question 78 • Section A [1 Mark]
P.5
Keeping Goats, Sheep, and Pigs
📌 UNEB PLE Science Past Papers
Give any one reason why veterinary doctors advise farmers NEVER to open the carcass of an animal suspected to have died of Anthrax.
✅Official UNEB Marking Guide / Expected Answer:
Because exposing the bacteria to oxygen/air causes them to form dormant spores that contaminate pasture and soil for decades.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for mentioning 'spore formation' or 'spreading fatal spores'.
Question 79 • Section A [1 Mark]
P.5
Keeping Goats, Sheep, and Pigs
📌 P.5 Science Coursebook (Term 3)
Name the farm structure used to hold cattle or goats firmly during hand spraying, drenching, or vaccination.
✅Official UNEB Marking Guide / Expected Answer:
Livestock Crush (or Crush).
💡
Candidate Pitfall / Examiner Note: Check spelling of 'Crush'.
Question 80 • Section A [1 Mark]
P.5
Keeping Goats, Sheep, and Pigs
📌 UNEB PLE Science Past Papers
What term refers to the meat obtained from an adult sheep?
✅Official UNEB Marking Guide / Expected Answer:
Mutton.
💡
Candidate Pitfall / Examiner Note: Must be Mutton (not lamb, as question specifies adult sheep).
Question 81 • Section B [4 Marks]
P.5
Keeping Goats, Sheep, and Pigs
📌 UNEB PLE Science Past Papers
The diagram below represents housing and management in goat farming:
(a) State the role of guard rails in a farrowing pen. (1 mark)
(b) Why should the floor of a goat shed be made of wooden slats raised off the ground? (1 mark)
(c) Name any two routine operations carried out in a livestock crush. (2 marks)
✅Official UNEB Marking Guide / Expected Answer:
(a) To prevent the sow from rolling over and crushing her piglets to death.
(b) To allow urine and droppings to fall through so the floor stays dry, preventing foot rot.
(c) (i) Drenching / Deworming (ii) Hand spraying / vaccination / hoof trimming.
💡
Candidate Pitfall / Examiner Note: Standard 4-mark UNEB livestock question.
Question 82 • Section B [4 Marks]
P.5
Keeping Goats, Sheep, and Pigs
📌 P.5 Science Coursebook (Term 3)
Livestock breeds have different commercial adaptations:
(a) Name the exotic goat breed kept primarily for high milk production. (1 mark)
(b) Which sheep breed is world-famous for producing fine wool? (1 mark)
(c) Give any two reasons why local indigenous goats like the Small East African goat are preferred by subsistence farmers. (2 marks)
✅Official UNEB Marking Guide / Expected Answer:
(a) Saanen (or Toggenburg).
(b) Merino sheep.
(c) (i) They have high resistance to local tick-borne diseases and parasites (ii) They can survive on poor quality browse and pasture.
💡
Candidate Pitfall / Examiner Note: Reward accurate breed identification.
Question 83 • Section B [4 Marks]
P.5
Keeping Goats, Sheep, and Pigs
📌 UNEB PLE Science Past Papers
Measly pork is a serious public health problem in Uganda:
(a) What causes measly pork in pigs? (1 mark)
(b) Name the parasite whose larvae cause this condition. (1 mark)
(c) State any two ways a community can prevent tapeworm transmission from pigs to humans. (2 marks)
✅Official UNEB Marking Guide / Expected Answer:
(a) Ingestion of human faeces containing tapeworm eggs by free-roaming pigs.
(b) Pork tapeworm (Taenia solium).
(c) (i) Inspecting all pork thoroughly before sale (ii) Cooking pork thoroughly until well done (iii) Confining pigs in pens (iv) Ensuring all people use latrines.
Question 84 • Section B [4 Marks]
P.5
Keeping Goats, Sheep, and Pigs
📌 P.5 Science Coursebook (Term 3)
A farmer noticed his goats were limping and producing a bad smell from their hooves:
(a) Which livestock disease is the farmer's herd likely suffering from? (1 mark)
(b) State the environmental condition in the goat pen that promotes this disease. (1 mark)
(c) Outline any two measures the farmer should take to control this disease. (2 marks)
✅Official UNEB Marking Guide / Expected Answer:
(a) Foot rot.
(b) Wet, muddy, and dung-filled dirty floors.
(c) (i) Regularly trim overgrown hooves (ii) Walk goats through a copper sulphate footbath (iii) Keep pens clean and dry (use slatted floors).
Question 92 • Section B [4 Marks]
P.5
Food and Nutrition
📌 UNEB PLE Science Past Papers
Weaning is an important milestone in infant growth:
(a) Define the term weaning. (1 mark)
(b) At what age should weaning start? (1 mark)
(c) Why should weaning NOT start earlier than this recommended age? (1 mark)
(d) State one danger of feeding a weaning child on plain maize porridge without enriching it. (1 mark)
✅Official UNEB Marking Guide / Expected Answer:
(a) The gradual introduction of semi-solid and solid complementary foods to an infant alongside breast milk.
(b) At 6 months of age.
(c) The infant's digestive system is immature and cannot digest solid starches (or high risk of contamination/diarrhea).
(d) Plain porridge lacks protein and causes Kwashiorkor.
💡
Candidate Pitfall / Examiner Note: Mark strictly on age (6 months) and digestive maturity.
Question 93 • Section B [4 Marks]
P.5
Food and Nutrition
📌 P.5 Science Coursebook (Term 3)
Vulnerable groups have special dietary requirements:
(a) Why is a convalescent person classified as a vulnerable individual? (1 mark)
(b) Which class of food should be increased in a convalescent's diet? (1 mark)
(c) State the nutritional role of dietary roughage in human digestion. (1 mark)
(d) Name any one local food source rich in dietary roughage. (1 mark)
✅Official UNEB Marking Guide / Expected Answer:
(a) Because they are recovering from illness and their damaged body tissues need repair and rebuilding.
(b) Proteins (and vitamins).
(c) It adds bulk to food and stimulates peristalsis to prevent constipation.
(d) Sukuma wiki / Cabbage / Whole grain cereals / Unpeeled fruits.
💡
Candidate Pitfall / Examiner Note: Award full marks for precise physiological explanations.
Question 94 • Section B [4 Marks]
P.5
Food and Nutrition
📌 UNEB PLE Science Past Papers
(a) What is colostrum? (1 mark)
(b) State two benefits of colostrum to a newborn infant. (2 marks)
(c) Name the condition that results from a severe lack of Iodine in the diet. (1 mark)
✅Official UNEB Marking Guide / Expected Answer:
(a) The first yellowish breast milk produced by a mother during the first few days after giving birth.
(b) (i) Rich in maternal antibodies that provide immediate passive immunity against infections (ii) Acts as a mild laxative to clear meconium from intestines.
(c) Goitre.
💡
Candidate Pitfall / Examiner Note: Standard 4-mark UNEB question on infant health.
Question 95 • Section A [1 Mark]
P.5
Primary Health Care (PHC)
📌 P.5 Science Coursebook (Term 3)
What is Primary Health Care (PHC)?
✅Official UNEB Marking Guide / Expected Answer:
Essential health care made universally accessible and affordable to individuals and families in the community through their full participation.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for the standard Alma-Ata definition.
Question 96 • Section A [1 Mark]
P.5
Primary Health Care (PHC)
📌 UNEB PLE Science Past Papers
State any one element of Primary Health Care.
✅Official UNEB Marking Guide / Expected Answer:
Immunisation (EPI) OR Safe water and sanitation OR Maternal and child health OR Health education OR Food and nutrition OR Essential drugs OR Control of endemic diseases OR Treatment of common diseases.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for any of the 8 elements.
Question 97 • Section A [1 Mark]
P.5
Primary Health Care (PHC)
📌 UNEB PLE Science Past Papers
Give any one reason why a residential living house should have large windows on opposite walls.
✅Official UNEB Marking Guide / Expected Answer:
To allow cross-ventilation (entry of fresh air and exit of stale air) to prevent respiratory infections.
💡
Candidate Pitfall / Examiner Note: Keyword: cross-ventilation or fresh air circulation.
Question 98 • Section A [1 Mark]
P.5
Primary Health Care (PHC)
📌 P.5 Science Coursebook (Term 3)
Why is it recommended to use clean wood ash at a tip-tap facility when soap is not available?
✅Official UNEB Marking Guide / Expected Answer:
Wood ash has alkaline antiseptic properties that destroy bacteria on hands.
💡
Candidate Pitfall / Examiner Note: Award 1 mark for 'kills germs' or 'acts like soap'.
Question 99 • Section A [1 Mark]
P.5
Primary Health Care (PHC)
📌 UNEB PLE Science Past Papers
State the minimum distance a pit latrine should be dug away from a domestic spring well or borehole.
Question 100 • Section A [1 Mark]
P.5
Primary Health Care (PHC)
📌 P.5 Science Coursebook (Term 3)
Name the community health workers who act as a frontline bridge between the village and health centres in Uganda.
✅Official UNEB Marking Guide / Expected Answer:
Village Health Teams (VHTs) / Community Health Workers.
💡
Candidate Pitfall / Examiner Note: Accept VHTs or Village Health Teams.
Question 101 • Section B [4 Marks]
P.5
Primary Health Care (PHC)
📌 UNEB PLE Science Past Papers
The diagram below shows a sanitary homestead structure:
(a) Name the structure described as a raised wooden rack used for drying utensils. (1 mark)
(b) Give two reasons why washed plates should be dried on this structure rather than on the ground. (2 marks)
(c) How does direct sunlight assist in the sanitation of utensils on this rack? (1 mark)
✅Official UNEB Marking Guide / Expected Answer:
(a) Raised dish drying rack (or Plate stand).
(b) (i) Keeps plates away from crawling insects, dogs, and chickens (ii) Prevents mud and dust splashes from dirtying clean plates.
(c) The ultraviolet (UV) rays of sunlight kill harmful bacteria on the plates.
💡
Candidate Pitfall / Examiner Note: Award 4 marks for complete sanitation rationale.
Question 102 • Section B [4 Marks]
P.5
Primary Health Care (PHC)
📌 UNEB PLE Science Past Papers
Primary Health Care involves responsibilities at different levels:
(a) State any one role of an individual in promoting PHC. (1 mark)
(b) State any one role of a school in promoting PHC. (1 mark)
(c) Mention any two roles played by Village Health Teams (VHTs) in a community. (2 marks)
✅Official UNEB Marking Guide / Expected Answer:
(a) Practicing personal hygiene (bathing, washing hands) OR sleeping under treated mosquito nets.
(b) Teaching health education OR providing clean separate latrines OR holding health parades.
(c) (i) Mobilising mothers for child immunisation days (ii) Treating uncomplicated malaria with ACTs / distributing ORS for diarrhea.
💡
Candidate Pitfall / Examiner Note: Award 1 mark per section.
Question 103 • Section B [4 Marks]
P.5
Primary Health Care (PHC)
📌 P.5 Science Coursebook (Term 3)
A Ventilated Improved Pit (VIP) latrine is an improvement over an ordinary pit latrine:
(a) State the function of the tall vent pipe on a VIP latrine. (1 mark)
(b) What is the purpose of the wire fly screen placed at the top of the vent pipe? (1 mark)
(c) Give any two reasons why a VIP latrine does not smell as badly as an ordinary pit latrine. (2 marks)
✅Official UNEB Marking Guide / Expected Answer:
(a) To suck out foul odours from the pit and expel them high into the air.
(b) To trap flies so they cannot escape and spread disease germs.
(c) (i) Wind blowing across the top of the vent pipe draws out smelly gases continuously (ii) The latrine interior is kept dark, forcing air currents up the pipe.
Question 104 • Section B [4 Marks]
P.5
Primary Health Care (PHC)
📌 UNEB PLE Science Past Papers
(a) Write down the full meaning of the abbreviation PHC. (1 mark)
(b) State any two core principles of Primary Health Care. (2 marks)
(c) Why is Primary Health Care considered more economical for developing nations like Uganda than curative hospital care? (1 mark)
✅Official UNEB Marking Guide / Expected Answer:
(a) Primary Health Care.
(b) (i) Community participation (ii) Affordability / Accessibility / Equity / Appropriate technology.
(c) Because preventive measures (sanitation, clean water, immunisation) cost very little compared to expensive drugs and hospital admission.
💡
Candidate Pitfall / Examiner Note: Reward clear economic and social understanding.
Question 105 • Section A [1 Mark]
P.7
The Muscular and Skeletal System
📌 PLE 2024 Section A
Name the disorder of the skeletal system where a bone moves away from its normal position at a joint.
✅Official UNEB Marking Guide / Expected Answer:
Dislocation (Reject: Fracture, Sprain, Strain)
💡
Candidate Pitfall / Examiner Note: Examiners strictly distinguish dislocation (displacement of bone from joint) from fractures (cracked/broken bone) and sprains (ligament damage).
Question 106 • Section A [1 Mark]
P.7
The Muscular and Skeletal System
📌 National Curriculum Guide
Give the scientific meaning of the term skeleton.
✅Official UNEB Marking Guide / Expected Answer:
A skeleton is the supporting structure of the body of an organism.
💡
Candidate Pitfall / Examiner Note: Reject 'A framework of bones in the body' because insects and soft-bodied animals have cuticles and hydrostatic skeletons without bones.
Question 107 • Section A [1 Mark]
P.7
The Muscular and Skeletal System
📌 PLE 2023 Section A
State the function of a ligament at a movable joint.
✅Official UNEB Marking Guide / Expected Answer:
It joins / attaches a bone to another bone at a joint. // Holds articulating bones in place to prevent dislocation.
💡
Candidate Pitfall / Examiner Note: Always mention 'at a joint'. Candidates who write 'joins bones together' without mentioning the joint lose the mark.
Question 108 • Section A [1 Mark]
P.7
The Muscular and Skeletal System
📌 P.7 Pre-PLE Mock Series
Name the longest and strongest bone found in the human body.
✅Official UNEB Marking Guide / Expected Answer:
Femur (or Thigh bone).
💡
Candidate Pitfall / Examiner Note: Ensure spelling is correct: Femur. The humerus is the longest in the arm, but the femur is the longest in the whole body.
Question 109 • Section A [1 Mark]
P.7
The Muscular and Skeletal System
📌 National Science Panel
Identify one airborne bacterial disease that affects the human skeleton.
✅Official UNEB Marking Guide / Expected Answer:
Tuberculosis of the spine / bones (or Spinal Tuberculosis / Pott's disease).
💡
Candidate Pitfall / Examiner Note: Do NOT write 'Tuberculosis' alone. In human skeleton questions, examiners require 'Tuberculosis of the spine / bones'.
Question 110 • Section A [1 Mark]
P.7
The Muscular and Skeletal System
📌 PLE Prep Guide
Why is an insect compelled to shed its outer covering periodically during growth?
✅Official UNEB Marking Guide / Expected Answer:
Because its exoskeleton is rigid / cannot stretch or expand to allow body growth.
💡
Candidate Pitfall / Examiner Note: Must link the non-stretching nature of the chitinous cuticle to the necessity of body expansion.
Question 111 • Section B [4 Marks]
P.7
The Muscular and Skeletal System
📌 PLE 2024 Section B (Q54)
(a) Name the two voluntary muscles found in the human upper arm.
(b) Give any one function of muscles in the human body.
(c) State any one importance of maintaining correct body posture in humans.
✅Official UNEB Marking Guide / Expected Answer:
(a) (i) Biceps (ii) Triceps [2 marks - Reject: Flexors / Extensors]
(b) Muscles produce movement and locomotion // Cardiac muscles pump blood // Diaphragm/intercostal muscles aid breathing // Sphincter muscles control urine release [1 mark]
(c) Prevents bone deformities // Prevents backaches, neck, and chest pains // Aids proper food digestion // Helps internal organs function properly [1 mark]
💡
Candidate Pitfall / Examiner Note: In part (a), candidates who write 'flexors and extensors' score 0. Examiners require the proper anatomical names: Biceps and Triceps.
Question 112 • Section B [4 Marks]
P.7
The Muscular and Skeletal System
📌 Integrated Science Guide
(a) Mention two connective tissues found at a movable joint in the human skeleton.
(b) State the difference in function between a tendon and a ligament.
(c) State any two ways in which friction is reduced at a movable joint.
✅Official UNEB Marking Guide / Expected Answer:
(a) Any two: Tendons, Ligaments, Cartilage. [1 mark]
(b) A tendon attaches muscle to bone, whereas a ligament joins bone to bone at a joint. [1 mark]
(c) (i) Synovial fluid lubricates the articulating bone surfaces.
(ii) Smooth articular cartilage cushions bone ends and prevents direct bone-to-bone contact. [2 marks]
💡
Candidate Pitfall / Examiner Note: Use the mnemonic BLB (Bone-Ligament-Bone) and MTB (Muscle-Tendon-Bone) to prevent reversing definitions in part (b).
Question 113 • Section B [4 Marks]
P.7
The Muscular and Skeletal System
📌 Standard Science Test
The diagram below illustrates a Primary 7 wooden teaching arm model:
[Upper Wood] connected by a [Hinge] to [Lower Wood], with [Cord] and [Rubber Band].
(a) Which bone in the human arm is represented by the upper wood?
(b) Name the muscle represented by: (i) Cord (ii) Rubber band
(c) What anatomical joint is represented by the hinge?
Candidate Pitfall / Examiner Note: This is a classic UNEB question. The cord pulls and shortens just like the biceps during flexion, while the rubber band stretches like the triceps.
Question 114 • Section B [4 Marks]
P.7
The Muscular and Skeletal System
📌 BOT 2 2024 Marking Guide
(a) What is a fracture?
(b) Distinguish between a simple fracture and a compound fracture.
(c) Give the main function of each of the following first aid items:
(i) Splints
(ii) Arm sling
✅Official UNEB Marking Guide / Expected Answer:
(a) A fracture is a broken or cracked bone in the body. [1 mark]
(b) In a simple fracture, the broken bone remains inside unbroken skin; in a compound fracture, the broken bone tears through muscle and pierces outside through the skin. [1 mark]
(c) (i) Splints: Immobilize and hold the broken bone in one fixed position to prevent movement. [1 mark]
(ii) Arm sling: Supports, immobilizes, and elevates a fractured or injured arm. [1 mark]
💡
Candidate Pitfall / Examiner Note: In (a), writing 'a broken bone' without mentioning 'cracked' loses precision. In (c)(i), 'keeps bone in one position' is the official mark-earning phrase.
Question 115 • Section B [4 Marks]
P.7
The Muscular and Skeletal System
📌 PLE Mock Series
(a) Name the five regions of the human vertebral column in order from neck to tail.
(b) Give the number of vertebrae in: (i) Cervical region (ii) Lumbar region
(c) State the function of the human vertebral column.
✅Official UNEB Marking Guide / Expected Answer:
(a) (1) Cervical, (2) Thoracic, (3) Lumbar, (4) Sacral / Sacrum, (5) Caudal / Coccyx [1 mark]
(b) (i) Cervical: 7 vertebrae [1 mark]
(ii) Lumbar: 5 vertebrae [1 mark]
(c) Protects the spinal cord // Supports the weight of the head and upper body. [1 mark]
💡
Candidate Pitfall / Examiner Note: Spelling of 'Cervical', 'Thoracic', 'Lumbar', 'Sacral', and 'Coccyx' must be accurate. Ensure the total adds up to 33.
Question 116 • Section A [1 Mark]
P.7
Electricity
📌 PLE 2023 Item 12
State the fundamental law of electrostatics concerning like and unlike charges.
✅Official UNEB Marking Guide / Expected Answer:
Like electric charges repel each other, while unlike electric charges attract each other.
💡
Candidate Pitfall / Examiner Note: State both parts clearly: like charges repel, unlike charges attract.
Question 117 • Section A [1 Mark]
P.7
Electricity
📌 PLE 2022 Item 18
Give one reason why copper is the preferred metal for manufacturing electrical conducting cables in domestic installations.
✅Official UNEB Marking Guide / Expected Answer:
Copper is a very good conductor of electricity with low electrical resistance (and it is ductile and relatively affordable).
💡
Candidate Pitfall / Examiner Note: Highlight low electrical resistance or high conductivity.
Question 118 • Section A [1 Mark]
P.7
Electricity
📌 PLE 2021 Item 22
Why is an electric fuse constructed using a wire with a low melting point?
✅Official UNEB Marking Guide / Expected Answer:
So that it melts and breaks the circuit easily when excessive or dangerous electric current surges through.
💡
Candidate Pitfall / Examiner Note: Mention melting to break the circuit upon overcurrent.
Question 119 • Section A [1 Mark]
P.7
Electricity
📌 Mukono Mocks Item 15
Identify the chemical substance used as a depolarizer in a standard dry Leclanché cell.
✅Official UNEB Marking Guide / Expected Answer:
Manganese dioxide ($MnO_2$).
💡
Candidate Pitfall / Examiner Note: Manganese dioxide oxidizes hydrogen gas into water.
Question 120 • Section A [1 Mark]
P.7
Electricity
📌 NCDC P.7 Unit Test
In an electric circuit diagram, which instrument is always connected in series to measure electric current?
✅Official UNEB Marking Guide / Expected Answer:
An Ammeter.
💡
Candidate Pitfall / Examiner Note: Ammeters connect in series; voltmeters connect in parallel.
Question 121 • Section A [1 Mark]
P.7
Electricity
📌 Candidate Master Series
What is the color code of the earth wire in a modern standard three-pin plug?
✅Official UNEB Marking Guide / Expected Answer:
Green with yellow stripes (or solid green).
💡
Candidate Pitfall / Examiner Note: Brown = Live, Blue = Neutral, Green/Yellow = Earth.
Question 122 • Section B [4 Marks]
P.7
Electricity
📌 PLE 2023 Item 44
(a) State the difference between static electricity and current electricity.
(b) Describe how static charges are produced on a plastic ruler.
(c) State two safety precautions taken to protect tall school buildings against lightning strikes.
✅Official UNEB Marking Guide / Expected Answer:
(a) Static electricity consists of electric charges at rest on a surface, whereas current electricity is the continuous flow of charges (electrons) through a conductor.
(b) By rubbing the plastic ruler vigorously with a dry cloth (or dry hair), causing transfer of electrons through friction.
(c) 1. Installing a functional lightning conductor with sharp copper spikes.
2. Ensuring the earth wire of the arrestor is deeply grounded in moist soil.
💡
Candidate Pitfall / Examiner Note: State that charges in current electricity are in continuous motion.
Question 123 • Section B [4 Marks]
P.7
Electricity
📌 PLE 2022 Item 48
The diagram represents a simple dry cell:
(a) Name the parts marked:
(i) Outer metal casing
(ii) Central black rod
(b) What is the function of the ammonium chloride paste?
(c) Why does a dry cell eventually lose power (go flat)?
✅Official UNEB Marking Guide / Expected Answer:
(a) (i) Zinc can (negative terminal). (ii) Carbon / Graphite rod with brass cap (positive terminal).
(b) It acts as the chemical electrolyte that allows ionic conduction of charges.
(c) The active chemicals (zinc and ammonium chloride) are completely consumed by the chemical reaction.
💡
Candidate Pitfall / Examiner Note: Zinc serves as both the container and the negative terminal.
Question 124 • Section B [4 Marks]
P.7
Electricity
📌 Jinja Diocesan Mocks Item 46
(a) Draw schematic circuit symbols for:
(i) A cell
(ii) An open switch
(b) State two advantages of connecting domestic lights in parallel rather than in series.
✅Official UNEB Marking Guide / Expected Answer:
(a) (i) Two parallel lines: one long thin line (+) and one short thick line (-).
(ii) A line with a gap and a raised lever not making contact.
(b) 1. Each bulb operates at full voltage and glows brightly.
2. If one bulb burns out or is switched off, the remaining bulbs in other branches stay on.
💡
Candidate Pitfall / Examiner Note: Independent branch operation is the main advantage of parallel circuits.
Question 125 • Section B [4 Marks]
P.7
Electricity
📌 National Candidate Drill Item 44
(a) What is a short circuit?
(b) State two common causes of short circuits in residential houses.
(c) Why should water never be used to extinguish an electrical fire?
✅Official UNEB Marking Guide / Expected Answer:
(a) A short circuit is an accidental direct connection between live and neutral wires with near-zero resistance, resulting in dangerously high current flow.
(b) 1. Frayed, worn-out, or damaged insulation on cables.
2. Overloading multi-plug sockets with heavy appliances.
(c) Ordinary water contains dissolved minerals and is a good electrical conductor, which will shock and electrocute anyone attempting to put out the fire.
💡
Candidate Pitfall / Examiner Note: Never use water on electrical fires—use dry powder or carbon dioxide fire extinguishers.