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Biology Hard css fpsc

Which plant hormone signals guard cells to close stomata during drought conditions?

  • A Abscisic acid
  • B Auxin
  • C Gibberellin
  • D Cytokinin
Correct Answer: Option A — Abscisic acid
Explanation:
Abscisic acid ABA is a plant stress hormone that signals guard cells surrounding stomata to close during drought conditions reducing water l...
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