Automated PLE Science Exam Paper Generator

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(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.

💡 Examiner Deduction Warning: Classic 4-mark UNEB sanitation question.

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(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.

💡 Examiner Deduction Warning: Never use water on electrical fires—use dry powder or carbon dioxide fire extinguishers.

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(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.

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(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.

💡 Examiner Deduction Warning: Mark strictly on age (6 months) and digestive maturity.

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(a) Saliva (b) Accept any two of: - Chewing / masticating food into small pieces - Softening and moistening food with saliva - Lubricating food to ease swallowing - Rolling food into a bolus by the tongue (c) Constipation

💡 Examiner Deduction Warning: Cognitive Level: Knowledge & Comprehension (K & C).

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(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.

💡 Examiner Deduction Warning: Mark strictly on environmental cause-and-effect.

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(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?

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(a) Kwashiorkor. (b) Marasmus. (c) Proteins. (d) Milk / Eggs / Fish / Mukene / Beans / Groundnuts.

💡 Examiner Deduction Warning: Clear 4-mark clinical comparison.

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(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.

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(a) Accept any two of: - Crushed oyster shells / snail shells - Crushed eggshells - Bone meal (crushed animal bones) - Crushed Mukene fish (b) Accept any two of: - Feeding layers on a balanced diet rich in calcium and proteins - Providing clean fresh drinking water at all times - Vaccinating and deworming birds regularly to control diseases - Maintaining clean, well-ventilated, and dry poultry housing with comfortable laying nests - Providing adequate artificial light to stimulate laying

💡 Examiner Deduction Warning: Cognitive Level: Comprehension & Application (C & A).

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(a) Agroforestry is the agricultural practice of growing crops, planting trees, and keeping livestock on the same piece of land at the same time. (b) Accept any one of: - Fast growing - Leguminous (fix nitrogen in the soil) - Deep-rooted (does not compete with crop roots) - Have multipurpose uses (provide fodder, firewood, fruits) (c) Accept any two of: - Provides an additional source of income and food/timber - Improves soil fertility through fallen leaf litter and nitrogen fixation - Trees act as windbreaks and control soil erosion - Leaves provide fodder for livestock

💡 Examiner Deduction Warning: Cognitive Level: Comprehension & Application (C & A).

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(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.

💡 Examiner Deduction Warning: Reward clear economic and social understanding.

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(a) Bronchus (plural: bronchi) (b) To keep the trachea open and prevent it from collapsing when air pressure drops (c) (i) Diaphragm: Contracts and flattens downward (ii) Volume of chest cavity: Increases

💡 Examiner Deduction Warning: Cognitive Level: Knowledge & Comprehension (K & C).

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(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

💡 Examiner Deduction Warning: Clear distinction in reversibility and living vs non-living matter.

✅ Official UNEB Section B Scoring Guide (Total: 4 Marks):

(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.

💡 Examiner Deduction Warning: Award 4 marks for complete sanitation rationale.