Tendrils coil around support after touch. Why is it called a growth response and not just feeling of touch?
Answer and explanation
Correct answer: Because after touch growth differs on the two sides
Tendrils show thigmotropism, a directional response to touch. Contact with a support changes growth patterns on the two sides of the tendril; the side away from the contact may elongate more, producing unequal growth and coiling around the support. The response is therefore a physical growth change, not a conscious sensation. Tendrils have no brain, and blood or hearing is irrelevant, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
Because after touch growth differs on the two sides
Why is this the correct answer?
Tendrils show thigmotropism, a directional response to touch. Contact with a support changes growth patterns on the two sides of the tendril; the side away from the contact may elongate more, producing unequal growth and coiling around the support. The response is therefore a physical growth change, not a conscious sensation. Tendrils have no brain, and blood or hearing is irrelevant, so option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
