Why do tendrils of a climber coil around a support?
Answer and explanation
Correct answer: Touch causes unequal growth on the two sides
The governing concept is thigmotropism, a directional growth response to touch. When a tendril touches a support, auxin distribution and cell elongation become unequal on its two sides. The untouched side generally grows more, so the tendril bends toward and coils around the support. Thus option A is correct; the other choices do not explain plant growth movement or involve blood, food production, or complete loss of light.
Frequently asked questions
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 directional growth response to touch. When a tendril touches a support, auxin distribution and cell elongation become unequal on its two sides. The untouched side generally grows more, so the tendril bends toward and coils around the support. Thus option A is correct; the other choices do not explain plant growth movement or involve blood, food production, or complete loss of light.
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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