What is the main reason for bending of the stem in phototropism?
Answer and explanation
Correct answer: Unequal distribution of auxin
In a shoot receiving light from one side, auxin becomes distributed unevenly, with more auxin generally accumulating on the shaded side. In shoots, this promotes greater cell elongation on that side. The unequal elongation produces curvature, so the stem bends towards the light. Plants have no blood, bones, or muscles; therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
Unequal distribution of auxin
Why is this the correct answer?
In a shoot receiving light from one side, auxin becomes distributed unevenly, with more auxin generally accumulating on the shaded side. In shoots, this promotes greater cell elongation on that side. The unequal elongation produces curvature, so the stem bends towards the light. Plants have no blood, bones, or muscles; therefore option A 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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