In a photo-tropic experiment, young seedlings in a box were subjected to light from one...

JAMB 1978

In a photo-tropic experiment, young seedlings in a box were subjected to light from one direction. The seedling continue to grow erect. Which of the following statement is correct

A. Only the tip of the seedling received the light
B. The light was not strong enough
C. The seedlings were rather too young
D. The tip of the seedling may have been covered
E. The box containing the seedling should have been placed on a laboratory bench

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Correct Answer: Option A

Explanation

Plants growing with an unshaded light source will grow straight up towards the sun because auxin is evenly distributed all around the shoot. Plants are able to “see” light using the tips of the plant shoots.

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