Which one of the following plant hormones (phytohormone) is known as a stress hormone?

Gibberellins

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Kinetin

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Auxin

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Abscisic acid

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Solution

The correct option is D Abscisic acid
The synthesis of ABA is stimulated by drought, water logging and other adverse environmental condition. Therefore, it is also called as stress hormone. It is also called as 'growth inhibitor hormone', because it causes inhibition of seed germination, closing of stomata etc
So, the correct answer is 'Abscisic acid'

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Which one of the following growth regulators is known as stress hormone?

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