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Question

How many of the following tissues are secondary in origin?
Interfascicular cambium, Phellem, Intrafascicular cambium, Phelloderm, Phellogen

A
2
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B
3
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C
4
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D
5
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Solution

The correct option is C 4
All the tissues that are formed from the secondary meristem are said to be secondary in origin.
Interfascicular cambium is formed by secondary growth from the cells of medullary rays.
Phellem or cork is also secondary tissue from the cells of cork cambium.
Intrafascicular cambium is a primary tissue meristem commonly found between xylem and phloem in vascular bundles of dicot plants.
Phelloderm or secondary cortex is a secondary tissue formed towards the inner side of the cork cambium. It consists of thin-walled parenchymatous cells.
Phellogen or the cork cambium is a secondary meristem which usually develops from the outer layer of the cortex.

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