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Stimulus and Response

A touch-me-no...

Question

A touch-me-not plant closes its leaf on being touched. is the stimulus in this case.

A

Wind

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B

Touch

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C

Leaf

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Solution

The correct option is B Touch
Stimulus is any external factor that causes a response in any organism. In this case, touch is a stimulus, which leads to a response - folding of leaves.

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