In dicot roots,after two or three years of se | vedclass

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(C) In dicot roots,secondary growth occurs due to the activity of the vascular cambium and the cork cambium (phellogen). As the secondary growth progr

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lost.

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(C) In dicot roots,secondary growth occurs due to the activity of the vascular cambium and the cork cambium (phellogen). As the secondary growth progresses,the phellogen cuts off cells on both sides. The cells cut off towards the outside differentiate into cork (phellem),and the cells cut off towards the inside differentiate into secondary cortex (phelloderm). Due to the continuous formation of secondary tissues,the pressure on the outer layers increases. Consequently,the primary cortex and epidermis are gradually crushed and eventually sloughed off (lost) after a few years of secondary growth.

In dicot roots,after two or three years of secondary growth,the cortex is:

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