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JAMB Biology 2003 Question 28

Question 28

Plant Responses and Hormones

The response of plants to external stimuli in a non-directional manner is known as

  1. A.Tactic movement
  2. B.Phototropism
  3. C.Geotropism
  4. D.Nastic movement.
Show the answer and explanation

Answer: D (Nastic movement.)

Explanation

Nastic movements do not depend on the direction of the stimulus, such as the folding of Mimosa leaves when touched. Tropisms are directional growth responses.