Grade 10 General Science MS Endterm 3 2026

END TERM 3 2026

GRADE 10

GENERAL SCIENCE

MARKING SCHEME & TEACHER'S GUIDE

TOTAL: 100 MARKS

MARKING CODES: M = Method/Formula mark; A = Accuracy/Correct answer; C = Concept/Curriculum point. Award equivalent marks for scientifically correct alternative wording.

1. Any two: helps understand biological, physical and chemical phenomena; supports functional investigation/application; supports problem solving; informs health/environmental decisions; supports technology and daily-life applications. (2 × 1) (2 marks)

2. Light microscope uses visible light and glass lenses; electron microscope uses electrons and electromagnetic lenses. Accept any two clear differences. (2 × 1) (2 marks)

3. Any two: large surface area; villi/microvilli; thin walls; rich blood supply; specialized regions/enzymes; muscular movement aiding mixing; suitable pH conditions. (2 × 1) (2 marks)

4. Aerobic respiration uses oxygen and releases more energy; anaerobic respiration occurs without oxygen and releases less energy. (2 × 1) (2 marks)

5. Any two: water, oxygen/air, suitable temperature. (2 × 1) (2 marks)

6. Any two valid methods: hand washing, safe food/water, sanitation, vaccination where appropriate, covering coughs/sneezes, disinfection, avoiding contaminated materials, vector control. (2 × 1) (2 marks)

7. Na = 2,8,1; Cl = 2,8,7. (1 + 1) (2 marks)

8. Any two paired differences: ionic involves transfer of electrons and attraction of ions; covalent involves sharing of electrons; ionic commonly forms giant lattices; covalent forms molecules/network structures depending on substance. (2 × 1) (2 marks)

9. Any two: temperature, concentration, pressure for gases, surface area, catalyst, nature of reactants, light where applicable. (2 × 1) (2 marks)

10. Moment = turning effect of a force about a point, equal to force × perpendicular distance from pivot. Wavelength = distance between corresponding points on successive waves, e.g. crest to crest. (1 + 1) (2 marks)