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Question

Periderm includes


A
Cork cambium (phellogen), cork (phellem) and secondary cortex (phelloderm)
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B
Cork cambium and cork
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C
Cork
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D
Cork and secondary phloem
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Solution

The correct option is A Cork cambium (phellogen), cork (phellem) and secondary cortex (phelloderm)
The periderm is the secondary protective (dermal) tissue that replaces the epidermis during growth in thickness of stems and roots of gymnosperms and dicotyledons (i.e., secondary growth). 
Unlike typical epidermis, the periderm is a multilayered tissue system, the bulk of which usually constitutes the cork, or phellem, cork cambium or phellogen and phelloderm or secondary cortex. Thus, option A is correct. 

Biology

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