Question
Opening and closing of stomata is controlled by
abscisic acid
CO2 concentration
O2 concentration
light intensity
Solution
A.
abscisic acid
B.
CO2 concentration
D.
light intensity
Opening and closing of stomata depends upon the turgidity of guard cells. When the plant has excessive water, the guard cells are turgid and stomata opens. It also depends on CO2 concentration. When CO2 concentration is low is photosynthetic parenchyma, stomata open to absorb more gas. Also as the luminosity increases, the rate of photosynthesis also increases leading to stomatal opening.
ABA or Abscisic Acid is a stress hormone that during water stress conditions induces stomatal closing.
