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JAMB Biology 1983 Question 12

Question 12

Transport in Plants

In woody plants, gases and water vapour are transported across the stems by the

  1. A.xylem fibres
  2. B.medullary rays
  3. C.sieve tubes
  4. D.phloem fibres
  5. E.phloem parenchyma.
Show the answer and explanation

Answer: B (medullary rays)

Explanation

Medullary rays are bands of parenchyma running outwards from the centre of the stem to the bark. They carry water, food and gases sideways across the stem.