Which of the following is not a response to a stimulus?
A
A mimosa plant closing its leaves
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B
A bird flying in the sky
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C
Withdrawing the hand on touching a hot object
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D
A plant growing towards sunlight
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Solution
The correct option is B
A bird flying in the sky
An external force which brings about a response from living organisms is called a stimulus. A bird flying could be doing so even without the presence of a stimulus.