In dicot roots,cork cambium is derived from

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(D) In dicot roots,secondary growth occurs due to the activity of vascular cambium and cork cambium.Cork cambium,also known as phellogen,develops in t

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Pericycle

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(D) In dicot roots,secondary growth occurs due to the activity of vascular cambium and cork cambium.Cork cambium,also known as phellogen,develops in the older roots.It arises from the dedifferentiation of the outer cells of the $Pericycle$.These cells undergo tangential divisions to form the cork (phellem) on the outside and the secondary cortex (phelloderm) on the inside.

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