Anatomy of Dicot and Monocot Roots · NCERT Biology

In roots, the protoxylem lies towards the periphery and metaxylem lies towards the center. This arrangement is called:

  1. Endarch
  2. Exarch
  3. Centripetal
  4. Diarch
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Correct answer: Exarch

The exarch condition is a defining characteristic of roots. In this arrangement, the younger protoxylem is directed towards the outside (periphery) while the older metaxylem is towards the inside.

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