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JAMB Biology 2012 Question 26

Question 26

Plant Responses and Hormones

Plant growth can be artificially stimulated by the addition of

  1. A.gibberellin
  2. B.kinin
  3. C.abscisic acid
  4. D.ethylene.
Show the answer and explanation

Answer: A (gibberellin)

Explanation

Gibberellins are growth hormones that make stems lengthen, so farmers spray them to boost growth. Abscisic acid and ethylene slow growth or cause ripening and leaf fall.