Question
Which one of the following growth regulators is known as stress hormone?
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abscsic acid
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Ethylene
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GA3
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Indole acetic acid
Solution
A.
abscsic acid
Abscisic Acid (ABA) is also known as stress hormone or dormin because it is produced in much higher amounts, when plants are subjected to various kinds of stresses. It often gives plants organs a signal that they are undergoing physiological stresses such as lack of water, saline soil, cold temperature and frost. ABA often cause responses that help plants and protect against these stresses.
