Which of the following is known as the $Stress$ $hormone$?

  • A
    Cytokinins
  • B
    Abscisic acid
  • C
    Gibberellins
  • D
    Ethylene

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Which of the following statements is true regarding the effect of hormones on stomata?

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Abscisic acid causes efflux of . . . . . . ions from guard cells and brings about closure of stomata.

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