On what basis are folding of Mimosa leaves and bending of a stem towards light different?
Answer and explanation
Correct answer: The first is a quick water-pressure-based movement and the second is a growth-based movement
The governing concept is the difference between nastic movement and tropic growth. Mimosa leaves fold rapidly after touch because changes in water content and turgor pressure occur in specialised pulvinus cells; this does not require directional growth. A stem bends toward light because auxin causes unequal elongation on its two sides, making it a slower growth response. Thus option A is correct; plants have no brain or blood circulation like animals, and both movements involve stimuli.
Frequently asked questions
What is the correct answer to this question?
The first is a quick water-pressure-based movement and the second is a growth-based movement
Why is this the correct answer?
The governing concept is the difference between nastic movement and tropic growth. Mimosa leaves fold rapidly after touch because changes in water content and turgor pressure occur in specialised pulvinus cells; this does not require directional growth. A stem bends toward light because auxin causes unequal elongation on its two sides, making it a slower growth response. Thus option A is correct; plants have no brain or blood circulation like animals, and both movements involve stimuli.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
