Coiling of a plant tendril around a support is based on which feature?
Answer and explanation
Correct answer: Unequal growth due to touch
The coiling of a tendril is a directional growth response called thigmotropism. When one side of the tendril touches a support, auxin-related growth effects produce unequal elongation on the two sides. The untreated or less-contacted side grows relatively faster, bending the tendril around the support. Therefore A is correct; the other options describe no valid mechanism for plant tendril coiling.
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What is the correct answer to this question?
Unequal growth due to touch
Why is this the correct answer?
The coiling of a tendril is a directional growth response called thigmotropism. When one side of the tendril touches a support, auxin-related growth effects produce unequal elongation on the two sides. The untreated or less-contacted side grows relatively faster, bending the tendril around the support. Therefore A is correct; the other options describe no valid mechanism for plant tendril coiling.
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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