internodal elongation is stimulated by ______________.

auxin

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ABA

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cytokinin

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gibberellin.

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Solution

The correct option is D gibberellin.
Internodal elongation is stimulated by gibberellins, the increase in internodal length is due to cell elongation and not cell division. On treatment with gibberellins physiological changes take place in the cells of the internodal region increasing their length 3-4 times the original.
This property is used in agriculture to enhance the yield from sugarcane.
So, the correct answer is 'gibberellin'

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