Question
Which of the following theory gives the latest explanation for the closure of stomata?
ABA theory
Munch Theory
Starch glucose theory
Active K+ transport theory
Solution
D.
Active K+ transport theory
As per 'Active K+ transport mechanism' accumulation of K+ ions occurs in the guard cells during the day inresponse 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.
