A plant was given light from one side. After some time the stem bent towards light. What is the main reason for this bending?
Answer and explanation
Correct answer: More auxin collects on the shaded side and increases cell growth
The governing concept is phototropism caused by unequal auxin distribution. When light comes from one side, auxin moves and accumulates more on the shaded side of a young shoot. In shoots, this higher auxin concentration promotes greater cell elongation there. The shaded side therefore grows faster, pushing the stem toward the light. The light side does not elongate more, and the other choices do not explain the directional bend; hence B is correct.
Frequently asked questions
What is the correct answer to this question?
More auxin collects on the shaded side and increases cell growth
Why is this the correct answer?
The governing concept is phototropism caused by unequal auxin distribution. When light comes from one side, auxin moves and accumulates more on the shaded side of a young shoot. In shoots, this higher auxin concentration promotes greater cell elongation there. The shaded side therefore grows faster, pushing the stem toward the light. The light side does not elongate more, and the other choices do not explain the directional bend; hence B is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
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