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JAMB Biology 1987 Question 39

Question 39

Plant Responses and Hormones

Unlike auxins, gibberellins

  1. A.induce the formation of adventitious roots
  2. B.do not affect leaf and fruit abscission
  3. C.cannot stimulate stem elongation
  4. D.are quite effective as herbicides.
Show the answer and explanation

Answer: B (do not affect leaf and fruit abscission)

Explanation

Auxins control leaf and fruit fall (abscission), cause rooting and are used as weedkillers. Gibberellins mainly cause stem elongation and do not control abscission.