Question

bending of shoots towards light occurs due to ______.

a absence of auxins

b unequal distribution of auxins

c equal distribution of auxins

d none of the above

Explanation:

The bending of plant shoots towards light (phototropism) is caused by the unequal distribution of the plant hormone auxin. When light hits one side of the shoot, auxin moves to the shaded side, causing cells there to elongate more, leading to bending towards light. Option a is incorrect as auxins are present. Option c is incorrect as equal distribution wouldn't cause bending. Option d is incorrect as the correct reason is in option b.

Answer:

b. Unequal distribution of auxins