Growth rings $(annual\ rings)$ are formed by the activity of:

  • A
    Cambium
  • B
    Xylem
  • C
    Phloem
  • D
    Both xylem and phloem

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Derivatives of the secondary meristem in the stelar region are

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$I.$ It does not help in water conduction.
$II.$ It is also called alburnum.
$III.$ It is dark in colour but very soft.
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