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JAMB Biology 1983 Question 15

Question 15

Plant Responses and Hormones

The movement of part of a plant in response to external stimulus of no particular direction is

  1. A.taxism
  2. B.tropism
  3. C.haptotropic movement
  4. D.nastic movement
  5. E.phototropism.
Show the answer and explanation

Answer: D (nastic movement)

Explanation

Nastic movements, such as the closing of flowers at night, respond to a stimulus but not to its direction. Tropisms depend on the direction of the stimulus.