When light comes from one side, the stem bends towards it. Why does more growth occur on the shaded side?
Answer and explanation
Correct answer: More auxin may accumulate on the shaded side
In a young shoot, one-sided light causes auxin to redistribute toward the shaded side. In the stem, auxin promotes cell elongation, so cells on the shaded side may elongate more than those on the illuminated side. This unequal growth produces curvature, making the stem bend toward the light. Therefore A is correct. Blood flow and root pulling are irrelevant, and option C does not describe the controlling mechanism.
Frequently asked questions
What is the correct answer to this question?
More auxin may accumulate on the shaded side
Why is this the correct answer?
In a young shoot, one-sided light causes auxin to redistribute toward the shaded side. In the stem, auxin promotes cell elongation, so cells on the shaded side may elongate more than those on the illuminated side. This unequal growth produces curvature, making the stem bend toward the light. Therefore A is correct. Blood flow and root pulling are irrelevant, and option C does not describe the controlling mechanism.
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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