Automated PLE Science Exam Paper Generator

✅ 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) (i) Black jack: Animal dispersal (epizoochory) (ii) Sycamore: Wind dispersal (b) Accept any two of: - Have wing-like structures (e.g. sycamore) - Have parachute of fine hairs / pappus (e.g. dandelion, tridax) - Are very small and light in weight - Are dust-like (e.g. orchids)

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

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

(a) Humerus [1 mark] (b) (i) Cord: Biceps muscle [1 mark] (ii) Rubber band: Triceps muscle [1 mark] (c) Elbow joint [1 mark]

💡 Examiner Deduction Warning: 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.

✅ 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) 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) 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) Soil drainage (or water retention capacity / porosity) (b) To prevent soil particles from falling into the collecting beaker / to filter soil from water (c) Sand soil drained fastest; because sand soil has larger particles with larger air spaces (pore spaces) that allow water to pass freely

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

✅ 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) 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) 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) 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) 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) 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).

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

(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.

💡 Examiner Deduction Warning: Reward accurate breed identification.

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

(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]

💡 Examiner Deduction Warning: In part (a), candidates who write 'flexors and extensors' score 0. Examiners require the proper anatomical names: Biceps and Triceps.