Leaf fall occurs in a tree when there is an increase in the concentration of . . . . . .

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

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Several plant growth regulators affect the opening of stomata. The closure of stomata is induced by ...........

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It is also called stress hormone.

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