Define variations in relation to a species. Why is variation beneficial to the species?

(a) List three events that occur during the process of photosynthesis. State in brief the role of stomata in this process. (b) Describe an experiment to show that sunlight is essential for photosynthesis.

Updated 1/12/2026

Define (a) Biomass (b) Anaerobic degradation.

Updated 1/12/2026

(a) What will happen to guard cells and the stomatal pore when water flows into guard cells. (b) How do plants transmit information from cell to cell?

Updated 1/12/2026

In a food chain comprising frogs, insects, birds and grass, which one of the organisms is likely to have maximum concentration of harmful non-biodegradable chemicals in the body.

Updated 1/12/2026

Maintenance of Posture and Equilibrium. Cerebellum. (a) Distinguish between voluntary and involuntary actions of our body. (b) Choose involuntary actions, amongst the following: Reading, Beating of heart, Salivation in the mouth on viewing tasty food, Talking.

Updated 1/12/2026