Touch-me-not leaves fold on touch but this is not tropism. What is the correct reason?
Answer and explanation
Correct answer: Because it does not involve growth according to direction
The governing concept is the difference between tropic growth and nastic movement. Tropism is a relatively directed growth response whose direction depends on the direction of the stimulus. Touch-me-not leaves fold rapidly after touch because changes in water pressure in specialised pulvinus cells cause movement; this is not directional growth. Since a stimulus is present but growth is not responsible, option A is correct.
Frequently asked questions
What is the correct answer to this question?
Because it does not involve growth according to direction
Why is this the correct answer?
The governing concept is the difference between tropic growth and nastic movement. Tropism is a relatively directed growth response whose direction depends on the direction of the stimulus. Touch-me-not leaves fold rapidly after touch because changes in water pressure in specialised pulvinus cells cause movement; this is not directional growth. Since a stimulus is present but growth is not responsible, 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.
