A) phelloderm
B) phellogen
C) dermatogen
D) cortex
Correct Answer: C
Solution :
Orchids are epiphytic monocots possessing absorbing roots hanging in air. Epiblema or piliferous layer is usually uniseriate in monocot roots but aerial roots of orchids possess a multiseriate epiblema called velamen. It is formed from dematogen.
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