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JAMB Biology 2012 Question 6

Question 6

Growth and Development

Plants that show secondary growth are usually found among the

  1. A.thallophytes
  2. B.pteridophytes
  3. C.monocotyledons
  4. D.dicotyledons.
Show the answer and explanation

Answer: D (dicotyledons.)

Explanation

Dicotyledons have a cambium between xylem and phloem that keeps dividing, so their stems and roots grow thicker (secondary growth). Monocots usually have no cambium.