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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.

Related tags

MimosaNastic MovementPhototropismControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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