Foolish seedling disease of rice led to the discovery of

  • A
    $ABA$
  • B
    $2,4-D$
  • C
    $IAA$
  • D
    $GA$

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Name the plant growth regulator which,upon spraying on sugarcane crop,increases the length of stem,thus increasing the yield of sugarcane crop.

The bioassay for gibberellin is:

All $GAs$ are .............

The hormone involved in the metabolism of food material in cereal grain during germination is

Gibberellin was first extracted from

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