If unequal distribution of auxin does not occur in a plant, what will happen to phototropism?
Answer and explanation
Correct answer: Bending of the stem towards light may reduce or stop
Phototropism requires unequal growth on the two sides of a young stem. Light causes auxin to become distributed unevenly, and the resulting difference in cell elongation bends the stem towards the light. If auxin distribution remains equal, this differential growth will not develop, so bending may greatly decrease or stop. Therefore option A is correct; the other choices do not follow from auxin action.
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What is the correct answer to this question?
Bending of the stem towards light may reduce or stop
Why is this the correct answer?
Phototropism requires unequal growth on the two sides of a young stem. Light causes auxin to become distributed unevenly, and the resulting difference in cell elongation bends the stem towards the light. If auxin distribution remains equal, this differential growth will not develop, so bending may greatly decrease or stop. Therefore option A is correct; the other choices do not follow from auxin action.
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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