Stomata open in the night at alkaline or neut | vedclass

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(C) Sayre proposed the $pH$ theory of stomatal movement. He observed that stomata open when the $pH$ of guard cells is high (alkaline or neutral,aroun

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Sayre

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(C) Sayre proposed the $pH$ theory of stomatal movement. He observed that stomata open when the $pH$ of guard cells is high (alkaline or neutral,around $7.0$) and close when the $pH$ is low (acidic,around $5.0$). In an atmosphere of ammonia vapours,the $pH$ inside the guard cells increases,which leads to the opening of stomata even at night. Therefore,the correct answer is $C$.

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

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