A) abscisic acid
B) \[\text{C}{{\text{O}}_{\text{2}}}\]concentration
C) concentration
D) light intensity
Correct Answer: A
Solution :
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 \[\text{C}{{\text{O}}_{\text{2}}}\]concentration. When \[\text{C}{{\text{O}}_{\text{2}}}\]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.
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