Which the following plant growth regulators is responsible for 'respiratory climactic'?

Auxiun

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Ethylene

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ABA

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Cytokinin

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Solution

The correct option is B Ethylene
Ethylene is a gaseous plant growth regulator that enhances the rate of respiration during ripening of fruits in plants. The rise in the rate of respiration is known as respiratory climactic. So, the correct option is 'Ethylene'.

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