A comprehensive collection of topical evaluation activities, guiding questions, and authentic Uganda National Examinations Board (UNEB PLE 2018β2024 & National Mock) past exam questions, complete with official examiners' marking schemes and candidate pitfall notes.
Question 1 β’ Section B [4 Marks]
P.6
Sound Energy
π 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.
β 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 2 β’ Section B [4 Marks]
P.6
Classification of Animals
π 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.
β 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 3 β’ Section B [4 Marks]
P.6
Science at Home and in Our Community
π P.6 Science Coursebook β’ 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?
β 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 4 β’ Section B [4 Marks]
P.6
Science at Home and in Our Community
π P.6 Science Coursebook β’ 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.
β 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 5 β’ Section B [4 Marks]
P.6
Science at Home and in Our Community
π P.6 Science Coursebook β’ 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 βββΊ Filtered βββΊ Point W βββΊ 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.
β 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 6 β’ Section B [2 Marks]
P.6
Science at Home and in Our Community
π P.6 Science Coursebook β’ Term 3 Evaluation Activity
State the importance of the following steps in cleaning clothes at home:
(i) Sorting
(ii) Soaking
β 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 7 β’ Section B [2 Marks]
P.6
Science at Home and in Our Community
π P.6 Science Coursebook β’ Term 3 Evaluation Activity
Question 8 β’ Section B [3 Marks]
P.6
Science at Home and in Our Community
π P.6 Science Coursebook β’ 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.
β 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 9 β’ Section B [4 Marks]
P.6
Science at Home and in Our Community
π P.6 Science Coursebook β’ Term 3 Evaluation Activity
Match the laundry terms in Part A with their correct scientific meanings in Part B:
Sorting
Wringing
Rinsing
Soaking
β 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 10 β’ Section B [4 Marks]
P.6
Science at Home and in Our Community
π 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.
β 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 11 β’ Section B [4 Marks]
P.6
Accidents and First Aid
π P.6 Science Coursebook β’ 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.
β 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 12 β’ Section B [4 Marks]
P.6
Accidents and First Aid
π P.6 Science Coursebook β’ 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.
β 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 13 β’ Section B [4 Marks]
P.6
Accidents and First Aid
π P.6 Science Coursebook β’ 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?
β 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 14 β’ Section B [4 Marks]
P.6
Accidents and First Aid
π 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.
β 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 15 β’ Section B [4 Marks]
P.6
Sanitation
π P.6 Science Coursebook β’ Term 3 Evaluation Activity
Study the waste transmission elements below and answer the questions that follow:
(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.
β 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 16 β’ Section B [4 Marks]
P.6
Sanitation
π P.6 Science Coursebook β’ 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?
β 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 17 β’ Section B [4 Marks]
P.6
Sanitation
π P.6 Science Coursebook β’ 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.
β 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 18 β’ Section B [4 Marks]
P.6
The Reproductive System
π P.6 Science Coursebook β’ 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.
β 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 19 β’ Section B [4 Marks]
P.6
The Reproductive System
π P.6 Science Coursebook β’ 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.
β 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 20 β’ Section B [4 Marks]
P.6
The Reproductive System
π P.6 Science Coursebook β’ Term 3 Evaluation Activity
Match the reproductive structures in Part A with their correct physiological functions in Part B:
Epididymis
Scrotum
Cervix
Vas deferens
β 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 21 β’ Section B [4 Marks]
P.6
The Reproductive System
π P.6 Science Coursebook β’ 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.
β 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 22 β’ Section B [4 Marks]
P.6
The Reproductive System
π 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.
β 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 23 β’ Section B [4 Marks]
P.5
Types of Changes in the Environment
π 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)
β 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)
π‘
Candidate Pitfall / Examiner Note: Candidate must correctly identify the missing factor in each test tube.
Question 24 β’ Section B [4 Marks]
P.5
Types of Changes in the Environment
π 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)
β 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
π‘
Candidate Pitfall / Examiner Note: Clear distinction in reversibility and living vs non-living matter.
Question 25 β’ Section B [4 Marks]
P.5
Types of Changes in the Environment
π 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)
β 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.
π‘
Candidate Pitfall / Examiner Note: Mark strictly on environmental cause-and-effect.
Question 26 β’ Section B [4 Marks]
P.5
Types of Changes in the Environment
π 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)
β 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).
π‘
Candidate Pitfall / Examiner Note: A classic 4-mark PLE question.
Question 27 β’ Section B [4 Marks]
P.5
Keeping Goats, Sheep, and Pigs
π 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)
β 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.
π‘
Candidate Pitfall / Examiner Note: Standard 4-mark UNEB livestock question.
Question 28 β’ Section B [4 Marks]
P.5
Keeping Goats, Sheep, and Pigs
π 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)
β 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.
π‘
Candidate Pitfall / Examiner Note: Reward accurate breed identification.
Question 29 β’ Section B [4 Marks]
P.5
Keeping Goats, Sheep, and Pigs
π 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)
β 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 30 β’ Section B [4 Marks]
P.5
Keeping Goats, Sheep, and Pigs
π 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)
β 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 32 β’ Section B [4 Marks]
P.5
Food and Nutrition
π 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)
β 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.
π‘
Candidate Pitfall / Examiner Note: Mark strictly on age (6 months) and digestive maturity.
Question 33 β’ Section B [4 Marks]
P.5
Food and Nutrition
π 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)
β 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.
π‘
Candidate Pitfall / Examiner Note: Award full marks for precise physiological explanations.
Question 34 β’ Section B [4 Marks]
P.5
Food and Nutrition
π 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)
β 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.
π‘
Candidate Pitfall / Examiner Note: Standard 4-mark UNEB question on infant health.
Question 35 β’ Section B [4 Marks]
P.5
Primary Health Care (PHC)
π 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)
β 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.
π‘
Candidate Pitfall / Examiner Note: Award 4 marks for complete sanitation rationale.
Question 36 β’ Section B [4 Marks]
P.5
Primary Health Care (PHC)
π 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)
β 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.
π‘
Candidate Pitfall / Examiner Note: Award 1 mark per section.
Question 37 β’ Section B [4 Marks]
P.5
Primary Health Care (PHC)
π 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)
β 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 38 β’ Section B [4 Marks]
P.5
Primary Health Care (PHC)
π 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)
β 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.
π‘
Candidate Pitfall / Examiner Note: Reward clear economic and social understanding.
Question 39 β’ Section B [4 Marks]
P.7
The Muscular and Skeletal System
π 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.
β 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]
π‘
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 40 β’ Section B [4 Marks]
P.7
The Muscular and Skeletal System
π 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.
β 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]
π‘
Candidate Pitfall / Examiner Note: Use the mnemonic BLB (Bone-Ligament-Bone) and MTB (Muscle-Tendon-Bone) to prevent reversing definitions in part (b).
Question 41 β’ Section B [4 Marks]
P.7
The Muscular and Skeletal System
π 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 42 β’ Section B [4 Marks]
P.7
The Muscular and Skeletal System
π 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
β 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]
π‘
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 43 β’ Section B [4 Marks]
P.7
The Muscular and Skeletal System
π 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.
β 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]
π‘
Candidate Pitfall / Examiner Note: Spelling of 'Cervical', 'Thoracic', 'Lumbar', 'Sacral', and 'Coccyx' must be accurate. Ensure the total adds up to 33.
Question 44 β’ Section B [4 Marks]
P.7
Electricity
π 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.
β 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.
π‘
Candidate Pitfall / Examiner Note: State that charges in current electricity are in continuous motion.
Question 45 β’ Section B [4 Marks]
P.7
Electricity
π 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)?
β 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.
π‘
Candidate Pitfall / Examiner Note: Zinc serves as both the container and the negative terminal.
Question 46 β’ Section B [4 Marks]
P.7
Electricity
π 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.
β 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.
π‘
Candidate Pitfall / Examiner Note: Independent branch operation is the main advantage of parallel circuits.
Question 47 β’ Section B [4 Marks]
P.7
Electricity
π 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?
β 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.
π‘
Candidate Pitfall / Examiner Note: Never use water on electrical firesβuse dry powder or carbon dioxide fire extinguishers.