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JAMB Biology 1987 Question 15

Question 15

Structure of Flowering Plants

The correct sequence of tissues in the anatomy of a young dicotyledonous stem from the inside to the outside is

  1. A.pith, phloem, cambium, xylem, parenchyma, collenchyma and epidermis
  2. B.xylem, phloem, cambium, cortex, endodermis, collenchyma and epidermis
  3. C.pith, xylem, cambium, phloem, collenchyma, parenchyma and epidermis
  4. D.phloem, xylem, cambium, cortex, endodermis, collenchyma and epidermis.
Show the answer and explanation

Answer: C (pith, xylem, cambium, phloem, collenchyma, parenchyma and epidermis)

Explanation

From the centre outwards a young dicot stem has pith, then xylem, cambium and phloem in the bundles, then the cortex tissues and finally the epidermis. Only C has the xylem inside the cambium and phloem outside it.