Which plant hormone promotes seed dormancy, bud dormancy, and causes stomata closure?

IAA

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Abscisic Acid (ABA)

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GA (Gibberellic Acid)

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Cytokinin

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Solution

The correct option is B Abscisic Acid (ABA)
Abscisic Acid (ABA) promotes seed and bud dormancy by inhibiting growth. It is one of the most important plant's growth regulators. ABA also plays an important role in the closure of stomata in plants under water stress and its presence inhibits opening.
So, the correct answer is option B.

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