Why is it incomplete to describe phototropism only as bending of a plant?
Answer and explanation
Correct answer: Because it is an auxin based unequal growth response towards light
The governing concept is plant hormonal coordination through a directional growth response. In phototropism, light causes unequal distribution of auxin in the shoot, so cells on the shaded side generally elongate more. This unequal growth produces bending toward the light; bending is therefore the visible result, not the complete mechanism. Option A is correct. The other choices incorrectly invoke muscles, blood flow, or a brain.
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What is the correct answer to this question?
Because it is an auxin based unequal growth response towards light
Why is this the correct answer?
The governing concept is plant hormonal coordination through a directional growth response. In phototropism, light causes unequal distribution of auxin in the shoot, so cells on the shaded side generally elongate more. This unequal growth produces bending toward the light; bending is therefore the visible result, not the complete mechanism. Option A is correct. The other choices incorrectly invoke muscles, blood flow, or a brain.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Control and Coordination. Topic: Plant hormones.
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