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JAMB Biology 2007 Question 34

Question 34

Plant Responses and Hormones

Use the diagram to answer: The part marked I will contain a high concentration of

Diagram for this question
  1. A.ascorbic acid
  2. B.abscisic acid
  3. C.ethylene
  4. D.auxin.
Show the answer and explanation

Answer: D (auxin.)

Explanation

In a root lying horizontally, gravity makes auxin collect on the lower side (I). There it slows growth, so the root curves downwards.