Which of the following is both a growth promoter as well as a growth inhibitor?

Auxin

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Gibberellins acid

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ABA

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Ethylene

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Solution

The correct option is A Ethylene
Ethylene is considered as the growth hormone which regulates promoter and inhibitor as it is used to make the fruit ripen, breaks bud dormancy, initiates flowering. It acts as inhibitor as it retards the mitotic division in root and shoot meristem and also for axillary buds.
So the correct option is 'Ethylene'.

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