Question

Phellogen and phellem respectively denote

• A. cork and cork cambium
• B. cork cambium and cork
• C. secondary cortex and cork
• D. cork and secondary cortex

Answer 1

The correct option is B cork cambium and cork

To prevent injuries to the secondary phloem, the roots develop a new cambium ring in the pericycle, called cork cambium( phellogen). The cork cambium originates as soon as the secondary vascular tissue begins to form.

The cells of cork cambium divide to form cells of cork (phellum) towards outer side and secondary cortex (phelloderm) towards inner side. It results in the formation of outer protective covering consisting of multilayered cork, cork cambium and multilayered secondary cortex.

So, the correct option is B.