Plant Growth Regulators · NCERT Biology

The physiological effect of 'Thinning' in cotton, cherry, and walnut is achieved using:

  1. Abscisic acid (ABA)
  2. Ethylene
  3. Cytokinin
  4. Gibberellin (GA)
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Correct answer: Ethylene

Ethylene (via Ethephon) promotes female flowers in cucumbers and accelerates the abscission (thinning) of fruits in cotton, cherry, and walnut to improve crop quality.

Difficulty: Medium Question 20 of 20

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