WAEC Biology 2011 Theory — Question 20
Question 20 of 27 from the West African Examinations Council (WAEC) Biology 2011 Theory paper, with the correct answer and a full explanation.
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5(b) State three differences between nitrogen fixation and denitrification.
Model answer
During nitrogen fixation, nitrogen is converted to nitrate; during denitrification, nitrate is converted to atmospheric nitrogen. Nitrogen fixation involves nitrogen-fixing bacteria while denitrification involves denitrifying bacteria. Nitrogen fixation requires moderate soil temperature while denitrification requires high soil temperature.
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