Describe briefly four ways in which individuals with a particular trait may increase in population.

“Variations that confer an advantage to an individual organism only will survive in a population.” Justify.

Updated 1/12/2026

(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