Question

Phellogen cuts off derivatives on the inner side to form _______ and on the outer side to form ________.

• A. Cork, Secondary cortex
• B. Secondary cortex, Cork
• C. Cork cambium, Cork
• D. Cork cambium, Secondary cortex

Answer 1

The correct option is B Secondary cortex, Cork

Phellogen or cork cambium cuts outs cells on either sides to form secondary cortex on the inner side, which is parenchymatous and hence living. It cuts off cork cells phellum cells on the outside which are non - living due to deposition of suberin making it impervious to water and pathogens. It has pores called lenticels for exchange of gases.

So, the correct answer is 'Secondary cortex, Cork'