Automated PLE Science Exam Paper Generator

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

(a) Chemical change (b) Physical change (c) Biological change (d) Physical change

💡 Examiner Deduction Warning: Cognitive Level: Comprehension (C). Exactly 1 mark per correct classification.

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

(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)

💡 Examiner Deduction Warning: Candidate must correctly identify the missing factor in each test tube.

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

(a) (i) Sanitation: The general cleanliness of the environment to promote public health / steps taken to keep an area clean. (ii) Personal hygiene: The cleanliness of the body and the materials used to clean it. (b) Accept any two of: - Sweeping rubbish from the compound - Picking up littered rubbish and disposing of it in dustbins or rubbish pits - Slashing tall grass and clearing bushes around the compound - Draining stagnant water to destroy mosquito breeding grounds - Scrubbing and cleaning latrines and urinals regularly

💡 Examiner Deduction Warning: Cognitive Level: Knowledge & Application (K & A).

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

(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

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

(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.

💡 Examiner Deduction Warning: Award full marks for precise physiological explanations.

✅ 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) 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) 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).

💡 Examiner Deduction Warning: Practical veterinary question.

✅ 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) 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) 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]

💡 Examiner Deduction Warning: 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.

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

(a) Accept any two of: - Accessibility of the site - Nearness to a water source for watering young seedlings - Type and drainage of soil - Availability of adequate land - Security against stray livestock and fire outbreaks (b) Accept any two of: - Provides timber and building poles for sale - Provides firewood and wood fuel - Provides shade and purifies the air - Can be used for apiculture (bee farming) - Creates employment opportunities

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

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

(a) Zero grazing (stall feeding) (b) Farmyard manure (FYM) / Compost manure (c) Accept any two of: - Easy collection of animal dung and urine for manure and biogas - Protects cattle from tick-borne diseases and pasture parasites - Requires a small piece of land - High milk production due to less energy wasted walking - Protects crops from being destroyed by roaming cattle

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

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

(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.

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

(a) (i) Orange (ii) Violet (b) Due to the difference in speeds and wavelengths of the different colors of light as they travel through glass (c) A rainbow is formed when white sunlight is refracted, dispersed, and totally internally reflected by airborne raindrops acting as tiny prisms

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