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Question

Biosynthesis of gibberellin is inhibited by
  1. AMO-1618 and cyocel
  2. Cytokinin
  3. Auxin
  4. All of the above

A
Cytokinin
B
AMO-1618 and cyocel
C
All of the above
D
Auxin
Solution
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Gibberellins are growth hormones. They stimulate cell elongation, thus help in plant growth. But certain commercial chemicals like AMO-1618 and cyocel are used to stunt growth. The chemicals inhibit the biosynthesis of gibberellin by blocking the pathway of gibberellin synthesis.
So, the correct answer is 'AMO-1618 and cyocel'.

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