Biology : PU-CET (U.G) 2017 Panjab University Entrance Exam With Answers

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56.

During Secondary Growth In A Stem, Cock Cambium Cuts Off Cells On Its Outer And Inner Sides, Outer Cells Differentiate Into :

A: Phellem

B: Phellogen

C: Phelloderm

D: Periderm

The answer is: A

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Explanation

During secondary growth in a stem, the cork cambium cuts off cells on its outer and inner sides. The outer cells differentiate into phellem, also known as cork cells. Therefore, the correct option is A: Phellem.

Phellogen is another name for cork cambium, which is the meristematic tissue responsible for producing the cork cells. Phelloderm is a tissue that forms on the inner side of the cork cambium and is derived from the inner cells of the cork cambium. Periderm is a collective term that refers to all the tissues that are produced by the cork cambium, including phellem, phellogen, and phelloderm.