Which one of these examples shows nastic movement?
A
Movement of roots downwards in the soil
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B
Folding of leaves of Mimosa pudica when touched
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C
Drooping of branch tips containing fully ripe fruit
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D
Climbing of grape vines
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Solution
The correct option is B
Folding of leaves of Mimosa pudica when touched
Nastic movement is the movement shown by plant part in response to environmental stimuli. This movement is repeatable and reversible. Examples include the folding of leaves of Mimosa pudica when touched. The folding and recoiling of leaves of Mimosa pudica in response to touch is called as thigmonastic movement.
Thus, the correct answer is 'Folding of leaves of Mimosa pudica when touched..'