WAEC Biology 2013 Objective — Question 9

Question 9 of 60 from the West African Examinations Council (WAEC) Biology 2013 Objective paper, with the correct answer and a full explanation.

What happens to a plant if the shoot tip is cut off and replaced by an agar block containing auxin?

A. It will stop growing
B. It will grow rapidly
C. It will continue to grow normallyCorrect
D. It will die completely

Explanation

Auxin, a plant growth substance, is produced at the apices. Growth is expected to be affected when the shoot tip is cut off; however, replacing the tip with an agar block containing auxin will arrest the situation, and the plant will continue to grow normally.

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