A) cork cambium
B) pro-cambium
C) secondary cortex
D) vascular cambium
Correct Answer: A
Solution :
The periderm consists of phellem (cork), phellogen (cork cambium) and phelloderm. The phellogen develops in the epidermis, the cortex, the phloem or the root pericycle and produces phellem toward the outside and phelloderm toward the inside.
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