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B
Dermatogen
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C
Phellogen
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D
Intercalary meristem
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Solution
The correct option is D Phellogen Lenticels are gaps in cork or external phellem in which a mass of parenchyma cells (complementary tissue) are present. The lenticel is a portion of the periderm which are developed through the activity of the phellogen. Lenticels are lens shaped openings in the trunk of woody trees. These help in exchange of gases between the atmosphere and inner cortical cells. The opening of lenticels is not regulated.