Q. Which growth hormone is associated with stomatal movements :
- Auxin
- ABA
- Gibberellin
- Cytokinin
Solution :
Correct option : B ABA is known to have a direct effect on the movement of stomata. When ABA is present, it does not allow the uptake of potassium ions which help in the opening of stomata and hence the pore closes. Effect of ABA is countered by hormones Auxin and Cytokinin. Gibberellins have a major contribution to cell elongation and growth. So the correct answer is ‘ABA’.
