Which hormone is strongly associated with stomatal closure during water stress?

Options

  • A. Auxin
  • B. Abscisic acid
  • C. Gibberellin
  • D. More than one of the above
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

B. Abscisic acid

Detailed Explanation

Abscisic acid (ABA) plays an important role in stomatal closure during water stress. When plants experience drought, ABA signalling causes changes in guard-cell ion and water balance, promoting closure of stomata and reducing water loss. Important plant hormones for examinations include auxin, gibberellin, cytokinin, ethylene and ABA.