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The cork cambium, cork and secondary cortex are collectively called
A
Phellem
B
Phelloderm
C
Phellogen
D
Periderm
Detailed Solution
During secondary growth a new meristem, the cork cambium or phellogen, develops in the cortex region.
The phellogen cuts off cells on the outer side that form the cork or phellem, and cells on the inner side that form the secondary cortex or phelloderm.
Phellogen (cork cambium), phellem (cork) and phelloderm (secondary cortex) are collectively known as the periderm.
Each of the other three terms names only one of these layers.
Hence they are collectively called the periderm.
The phellogen cuts off cells on the outer side that form the cork or phellem, and cells on the inner side that form the secondary cortex or phelloderm.
Phellogen (cork cambium), phellem (cork) and phelloderm (secondary cortex) are collectively known as the periderm.
Each of the other three terms names only one of these layers.
Hence they are collectively called the periderm.