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Q.
Which of the following is responsible for opening and closing of stomata?
Transport in Plants
Solution:
Opening and closing of stomata are controlled by all the factors mentioned in the options. Rise in $pH$ of guard cells causes hydrolysis of starch and so stomata open, cytokinin and cyclic AMP are required for stomatal opening and abscisic acid stops the $K ^{+}$ ions exchange and $pH$ is decreased finally leading to closure of stomata.