16. a) The graphs show the effect of raw sewage effluent on a river. (ii) (iii)...

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16. a) The graphs show the effect of raw sewage effluent on a river. (ii) (iii) Describe the effect of discharging raw sewage into the river at point 'A' on. Bacteria (4mks) Oxygen. Algae b) Explain the behaviour of; (i) Oxygen as shown in the graph. (ii) The disappearance and appearance of fresh water animals. (iii) The algae. c) State and explain two other causes of water pollution. d) State two methods which can be used to prevent water pollution. (2mks) (3mks) (2mks) (4mks) (2mks) 16. a) The graphs show the effect of raw sewage effluent on a river. (ii) (iii) Describe the effect of discharging raw sewage into the river at point 'A' on. Bacteria (4mks) Oxygen. Algae b) Explain the behaviour of; (i) Oxygen as shown in the graph. (ii) The disappearance and appearance of fresh water animals. (iii) The algae. c) State and explain two other causes of water pollution. d) State two methods which can be used to prevent water pollution. (2mks) (3mks) (2mks) (4mks) (2mks)