The arrangement of secondary xylem and secondary phloem is respectively:

  • A
    Centrifugal and centripetal
  • B
    Centripetal and centrifugal
  • C
    Both centripetal
  • D
    Both centrifugal

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Knots in wood are formed due to ...........

Knots in stems are formed due to

$A$: Bark is all the tissues outside the vascular cambium.
$R$: Bark is formed due to the activity of phellogen only.

The combination of phelloderm,phellogen,and phellem is collectively known as ..........

In the dicot root,the vascular cambium originates from:

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