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JAMB Biology 2007 Question 33

Question 33

Plant Responses and Hormones

Use the diagram to answer: The experiment demonstrates

Diagram for this question
  1. A.geotropism
  2. B.thigmotropism
  3. C.phototropism
  4. D.hydrotropism.
Show the answer and explanation

Answer: A (geotropism)

Explanation

On the rotating klinostat gravity acts on all sides equally and the root grows straight, while the still seedling's root bends down. This shows growth response to gravity (geotropism).