Why is folding of a Mimosa leaf on touch different from phototropism?
Answer and explanation
Correct answer: It occurs through rapid water movement in cells, whereas phototropism is growth based
The governing distinction is between a rapid nastic movement and a slower tropic growth response. Touch causes a quick change in water content and turgor pressure in specialized cells at the Mimosa leaf base, so the leaf folds without directional growth. Phototropism requires unequal growth in response to light and develops more slowly. Therefore option A is correct; the other choices incorrectly invoke seeds, blood, a nervous system, or bones.
Frequently asked questions
What is the correct answer to this question?
It occurs through rapid water movement in cells, whereas phototropism is growth based
Why is this the correct answer?
The governing distinction is between a rapid nastic movement and a slower tropic growth response. Touch causes a quick change in water content and turgor pressure in specialized cells at the Mimosa leaf base, so the leaf folds without directional growth. Phototropism requires unequal growth in response to light and develops more slowly. Therefore option A is correct; the other choices incorrectly invoke seeds, blood, a nervous system, or bones.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
