What is the deeper reason behind a tendril coiling around a support?
Answer and explanation
Correct answer: Touch causes unequal growth on the two sides
The governing concept is thigmotropism, a growth response to touch. When one side of a tendril contacts a support, growth is not equal on its two sides. Cells on the side away from contact generally elongate more, producing curvature that wraps the tendril around the support. Therefore option A is correct. The other choices wrongly attribute the movement to a heart, an animal hormone or a spinal cord.
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What is the correct answer to this question?
Touch causes unequal growth on the two sides
Why is this the correct answer?
The governing concept is thigmotropism, a growth response to touch. When one side of a tendril contacts a support, growth is not equal on its two sides. Cells on the side away from contact generally elongate more, producing curvature that wraps the tendril around the support. Therefore option A is correct. The other choices wrongly attribute the movement to a heart, an animal hormone or a spinal cord.
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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