A stimulus is:

A plant hormone.

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An enzymatic reaction.

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An external disturbance or impulse.

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A deadly infection for plants.

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Solution

The correct option is C An external disturbance or impulse.
Stimulus is an event or any change in the external environment that evokes a specific functional reaction in an organ or tissue.

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Which of the following recieves an external stimulus and generates an impulse in response?

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