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Question

Active divisions occur in the cells of

A
Xylem
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B
Phloem
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C
Cambium
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D
Collenchyma
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Solution

The correct option is D Cambium
  • The cambium is a layer of actively dividing cells present between xylem and phloem tissues.
  • They are responsible for the secondary growth of stems and roots i.e, helps in increasing the girth or thickness in plants.
  • The cambium is a single layer of initial cells which actively divide to form several cell layers that are collectively called the cambial zone.
  • The cambial cells divide continuously to produce secondary xylem cells towards the centre of the stem and secondary phloem cells toward the outer side.
  • These cambial cells originate from the undifferentiated meristematic cells which have retained the embryonic capacity for continued growth and differentiation.
  • Xylem, phloem (compound tissue) and collenchyma (simple tissues) are permanent tissues which have lost the ability to divide.
So, the correct answer is 'Cambium'.

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