Plant Growth Regulators · NCERT Biology

The respiratory climacteric, an increase in respiration rate during fruit ripening, is triggered by:

  1. Abscisic acid
  2. Ethylene
  3. Auxin
  4. Gibberellin
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Correct answer: Ethylene

Ethylene is highly effective in fruit ripening. It enhances the respiration rate during ripening of the fruits; this rise in rate of respiration is called respiratory climacteric.

Difficulty: Medium Question 14 of 20

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