A) ABA theory
B) Munch theory
C) Starch glucose theory
D) Active K4 transport theory
Correct Answer: D
Solution :
As per 'Active K+ transport mechanism accumulation of K_ ions occurs in the guard cell during the day in response to light. It increases the turgidity of guard cells, consequently stomata open. During night, ions move out of the guard cells into surrounding epidermal cells consequently guard cells become flaccid and stomata close.
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