JAMB Biology 2012 Objective — Question 22
Question 22 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2012 Objective paper, with the correct answer and a full explanation.
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Which of the following is involved in secondary thickening in plants?
- A. Collenchyma and xylem cells
- B. Vascular cambium and collenchyma cells
- C. Vascular cambium and cork cambiumCorrect
- D. Cork cambium and sclerenchyma
Explanation
In gymnosperms and dicotyledons, growth does not only take place by the activities of apical root, apical stem and intercalary meristems but also by the activities of the vascular cambium and cork cambium to bring about increase in the diameter of the roots and stem. This is known as secondary growth.
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