Which of the following is not an example of response to stimulus?
A
Watering in mouth when we see delicious food items.
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B
Closing of leaves of mimosa plant when touched.
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C
Shutting our eyes when an object is suddenly thrown in our direction.
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D
A chick hatching out of an egg.
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Solution
The correct option is D A chick hatching out of an egg. Stimulus is a detectable change in the internal or external environment. The ability of an organism or organ to respond to external stimuli is called sensitivity.