Which of the following growth hormone was isolated by cleoptiles of oat?

Auxin

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Cytokinin

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Gibberellins

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None of the above

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Solution

The correct option is A Auxin
The plant growth hormone auxin is synthesized maximum at the growing tips of the plant. The coleoptile tips are the shoot tips of the oat plant which were cut and used for the isolation of the auxin. The hormone causes apical dominance which allows the growth of the shoot tip suppressing the lateral buds.
Thus, the correct answer is 'Auxin'

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Which of the following hormones is not secreted by anterior pituitary?

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