Automated PLE Science Exam Paper Generator

✅ 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) 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.

💡 Examiner Deduction Warning: Standard 4-mark UNEB livestock question.

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

(a) Accept any two of: - Causes liver cirrhosis (liver damage) - Causes high blood pressure and heart attacks - Causes brain and nerve damage (loss of memory / coordination) - Causes stomach ulcers (b) Accept any two of: - Leads to domestic violence and child neglect - Leads to poverty through wasting family income on alcohol - Leads to family breakdown and divorce - Leads to loss of jobs and unemployment

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

✅ 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) Chlorophyll (b) Ferns make their own food through photosynthesis (autotrophic nutrition), whereas mushrooms cannot make food and absorb nutrients from decaying organic matter (saprophytic nutrition) (c) Accept any two of: - Mosses - Liverworts - Horsetails - Algae - Hornworts

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

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

(a) Amniotic fluid (b) Accept any two of: - Transports oxygen and nutrients from placenta to foetus - Transports carbon dioxide and metabolic waste products from foetus to placenta - Transports antibodies and hormones to the foetus - Attaches the foetus to the placenta (c) Ovary

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

✅ 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) 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) 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.

💡 Examiner Deduction Warning: State that charges in current electricity are in continuous motion.

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

(a) Volume: The loudness or softness of a sound (b) Pitch: The highness or lowness of a sound (c) Frequency: The number of vibrations (cycles) per second (d) Echo: Reflected sound

💡 Examiner Deduction Warning: Cognitive Level: Knowledge (K). Exact UNEB definitions required.

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

(a) Wheel and axle (b) Accept any two of: - Steering wheels of motor vehicles - Screwdrivers when tightening screws - Door knobs for opening doors - Bicycle pedals and handlebars - Pencil sharpeners (c) Friction (frictional force)

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

✅ 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) 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) 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) 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).