What is the effect of Abscisic Acid $(ABA)$?

  • A
    Stomatal closure
  • B
    Stem elongation
  • C
    Leaf expansion
  • D
    Root elongation

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

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Abscisic acid $(ABA)$ regulates which of the following?

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