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JAMB Biology 1989 Question 33

Question 33

Plant Responses and Hormones

Fruit enlargement can be induced by spraying young ovary with

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

Answer: D (auxin, cytokinin and gibberellin)

Explanation

Auxins, gibberellins and cytokinins all promote growth and fruit development; abscisic acid and ethylene promote ripening, ageing and fall.