A) dedifferentiated parenchyma cells of cortex
B) dedifferentiated collenchyma cells of cortex
C) parenchyma cells of medullary ray
D) parenchyma cells of pericycle.
Correct Answer: B
Solution :
(Both a and b): The phellogen or cork cambium, is initiated by dedifferentiation of various types of cells. Depending on the position of cork cambium, the originating cells may be the epidermal cells, cortical collenchyma or parenchyma cells or pericycle cells (in case of root). Later on in subsequent growing seasons, cork cambium generally differentiates from phloem cells in both roots and stem.
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