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JAMB Biology 1990 Question 16

Question 16

Structure of Flowering Plants

Which of the following cells is thin-walled and living at maturity?

  1. A.Collenchyma
  2. B.Sieve tube
  3. C.Xylem vessel
  4. D.Sclerenchyma
Show the answer and explanation

Answer: B (Sieve tube)

Explanation

Sieve tubes have thin cellulose walls and remain living. Collenchyma walls are thickened at the corners; xylem vessels and sclerenchyma are dead and thick-walled.