JAMB Biology 1978 Question 44

In a phototropic experiment, young seedlings in a box were subjected to light from one direction. The seedlings continued to grow erect. Which of the following statements is correct?

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