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Opening and Closing of the Stomata

Stomata opens...

Question

Stomata opens in the night at alkaline or neutral pH(in the atmosphere of ammonia vapours). This statement was given by

A

Van Helmont

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B

Van Neil

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C

Sayre

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D

Van Mohl

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Solution

The correct option is C Sayre
Sayre reported that stomata open when pH is higher (7) and close when pH is low (5), i.i., high pH favours stomatal opening.

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