Automated PLE Science Exam Paper Generator

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

(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.

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

(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).

💡 Examiner Deduction Warning: A classic 4-mark PLE question.

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

(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. 💡 Would you like me to compile these exact evaluation questions into a ready-to-print, beautifully formatted PDF worksheets file for your classroom tests?

✅ 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):

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.

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

(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]

💡 Examiner Deduction Warning: Use the mnemonic BLB (Bone-Ligament-Bone) and MTB (Muscle-Tendon-Bone) to prevent reversing definitions in part (b).

✅ 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) (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]

💡 Examiner Deduction Warning: Spelling of 'Cervical', 'Thoracic', 'Lumbar', 'Sacral', and 'Coccyx' must be accurate. Ensure the total adds up to 33.

✅ 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.

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

(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.

✅ 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) 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) First class lever (b) Load × Load Arm = Effort × Effort Arm (Clockwise moments equal Anticlockwise moments) (c) Accept any two of: - Pair of scissors - See-saw - Claw hammer (when pulling out nails) - Beam balance - Pliers

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

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

(a) Vena cava (Superior and Inferior vena cava) (b) Oxygenated blood (c) Accept any two of: - Have thick muscular walls to withstand high blood pressure from the heart - Have narrow lumen to maintain high pressure - Have elastic walls to expand and recoil as blood pulses - Have no valves (except at the base of the aorta and pulmonary artery)

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

✅ 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.