First slide

Secondary Growth

Question

Identify the correct order of the components with reference to their arrangement from outer side to inner side in bark.

Easy

A

Phellogen $\to$ Phellem $\to$ Phelloderm $\to$ Secondary Phloem
B

Secondary phloem $\to$ Phellem $\to$ Phellogen $\to$ Phelloderm
C

Phellem $\to$ Phellogen $\to$ Phelloderm $\to$ Secondary Phloem
D

Phellem $\to$ Phellogen $\to$ Secondary Phloem $\to$ Phelloderm

Solution

As the stem continues to increase in girth due to the activity of vascular cambium, the outer cortical and epidermis layers get broken and need to be replaced to provide new protective cell layers. Hence, sooner or later, another meristematic tissue called cork cambium or phellogen develops, usually in the cortex region. Phellogen is a couple of layers thick. It is made of narrow, thin-walled and nearly rectangular cells. Phellogen cuts off cells on both sides. The outer cells differentiate into cork or phellem while the inner cells differentiate into secondary cortex or phelloderm. Inner to the phelloderm lies the secondary phloem.

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