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  4. Which plant hormone promotes seed dormany, bud dormancy and causes stomatal closure?

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Q. Which plant hormone promotes seed dormany, bud dormancy and causes stomatal closure?

ManipalManipal 2015

Solution:

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.