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.
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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.
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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.
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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.