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JAMB Biology 2009 Question 13

Question 13

Transport in Plants

Use the diagram to answer: The structure that controls loss of water vapour during transpiration is labelled

Diagram for this question
  1. A.I
  2. B.II
  3. C.III
  4. D.IV.
Show the answer and explanation

Answer: D (IV.)

Explanation

IV points to the guard cells around the stoma in the lower epidermis. They open and close the pore and so control how much water vapour escapes.