WAEC Biology 2018 Theory — Question 15
Question 15 of 19 from the West African Examinations Council (WAEC) Biology 2018 Theory paper, with the correct answer and a full explanation.
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6.(a)(i) Explain briefly chemosynthesis as a mode of nutrition. (ii) Give two examples of organisms that carry out chemosynthesis.
Model answer
(i) Chemosynthesis is a mode of nutrition in which organisms manufacture organic food using energy obtained from the oxidation of simple inorganic substances (such as ammonia), rather than from sunlight. (ii) Examples: Nitrobacter and Nitrosomonas (nitrifying bacteria); sulphur bacteria.
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