First slide

Secondary Growth

Question

The cells that cut off from the phellogen on the outer side are:

Easy

A

Suberised cork cells which are impervious to water
B

Non-suberised cork cells that is impervious to gases
C

Parenchymatous secondary cortex
D

Periderm that includes cork cells and lenticels

Solution

Phellogen cuts off cells on both sides. The outer cells differentiate into cork or phellem. The cork is impervious to water due to suberin deposition in the cell wall.

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