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(a) (i) What is meant by the term biological control?
(b) (i) What is eutrophication?
(c) Name a substance that is responsible for acid
rain.

Answer Text:
(a) (i) - Biological control is using a living organisms to
regulate or control or reduce the population of another organisms.
(ii)- Lady bird(beetle) used to control Aphids in coffee.
- Cats used to control rats in the store/snakes.
- Wasps used to control coffee mealy bugs.
(b) (i) - Is the enrichment of water bodies with minerals like nitrates/phosphates/sulphates due to discharge of sewage or domestic effluent water containing water detergents or runoff water fertilizer leading to rapid growth of aquatic plant.
(c) - Nitrogen (IV) oxide
- Sulphur (IV) oxide.