The folding of touch-me-not leaves on touching is which type of movement?
Answer and explanation
Correct answer: Non-directional movement caused by touch
Touch-me-not leaves fold rapidly after contact because water movement changes the turgor pressure in special motor cells at the leaf base. The response does not depend on the direction from which the touch comes and is not a growth movement, so it is a non-directional touch-induced movement, commonly called thigmonasty or seismonasty. Thus option A is correct; the other choices are directional tropisms.
Frequently asked questions
What is the correct answer to this question?
Non-directional movement caused by touch
Why is this the correct answer?
Touch-me-not leaves fold rapidly after contact because water movement changes the turgor pressure in special motor cells at the leaf base. The response does not depend on the direction from which the touch comes and is not a growth movement, so it is a non-directional touch-induced movement, commonly called thigmonasty or seismonasty. Thus option A is correct; the other choices are directional tropisms.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
