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a
Phellogen develops during ongoing process of secondary growth.
b
Cells cut by phellogen differentiate into outer phloem and inner xylem.
c
Periderm includes phellogen and pericycle.
d
Phellogen develops usually in the epidermal region.
answer is A.
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Detailed Solution
Phellogen is formed from cortical cells in dicot stem and pericycle cells in dicot root. Cells formed from phellogen differentiate into outer cork and inner secondary cortex.