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Why is folding of Mimosa leaves on touch not a growth-based movement?

Answer and explanation

Correct answer: Because it is rapid and does not depend on an increase in cell length

The governing concept is nastic movement caused by changes in cell turgor, not permanent growth. Mimosa leaves fold within seconds after touch because water shifts in specialised motor cells at the leaf base, changing their pressure. No lasting increase in cell length is required. Therefore option A is correct; the movement is not restricted to roots, and it is unrelated to darkness or seed formation.

Related tags

MimosaNastic MovementTurgor PressureControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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