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Q.

Which of the following is an example of a nastic movement?

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a

Sunflower facing the Sun

b

Growth of a pollen tube towards the ovule

c

Movement of roots towards the soil

d

Closing of leaves in Mimosa plant

answer is D.

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Detailed Solution

The nastic response of the plants to touch is known as thigmonasty. When the leaflets of a sensitive plant are touched, the leaflets fold quickly due to the change in turgor pressure.

Because of this, Mimosa pudica is known as the "touch me not" plant.

The rest of the options are examples of tropic movements.

Hence, the correct option is the closing of leaves in Mimosa plant.

 

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