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Question

Which one of the following are not essential for opening of stomata?

A
Cytokinin
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B
Temperature
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C
Mechanical shock
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D
Rise in pH
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Solution

The correct option is C Cytokinin
Cytokinins are plant hormones that cause increased cell division by stimulating the process of mitosis. Hence they are not essential for opening stomata.
So, the correct option is 'Cytokinin'

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