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Question
The cork cambium, cork and secondary cortex are collectively called as
The cork cambium, cork and secondary cortex are collectively called as
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Solution
The correct option is B Periderm
In extrastelar secondary growth, epidermis and pericycle with parenchyma or collenchyma cells acquire secondary meristematic property by de-differentiation and is called as cork cambium. It is a lateral meristem which helps in secondary growth. It produces tough protective material called as cork. The phelloderm is present inside the cork cambium. The phelloderm (secondary cortex), phellogen (cork cambium) and phellem (cork) are the primary covering layer when the epidermis gets ruptured. This periderm is protective layer of the dicot stem.Thus, the correct answer is option D.
In extrastelar secondary growth, epidermis and pericycle with parenchyma or collenchyma cells acquire secondary meristematic property by de-differentiation and is called as cork cambium. It is a lateral meristem which helps in secondary growth. It produces tough protective material called as cork. The phelloderm is present inside the cork cambium. The phelloderm (secondary cortex), phellogen (cork cambium) and phellem (cork) are the primary covering layer when the epidermis gets ruptured. This periderm is protective layer of the dicot stem.
Thus, the correct answer is option D.
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