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.
Frequently asked questions
What is the correct answer to this question?
Because it is rapid and does not depend on an increase in cell length
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
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