Explanation:
Exp:D The periderm is a protective tissue that is formed during secondary growth in the stems, branches and roots of most dicotyledons and gymnosperms. Periderm composed of phellem, phellogen and phelloderm.
- \(\quad\) Phellem are also called suberized cells which develop outside of the plant. They protect plants from the penetration, ingestion by animals, temperature changes, excessive evaporation etc.
- \(\quad\) Phellogen is also called cork cambium and it is the meristematic layer that is responsible for the development of periderm.
- \(\quad\) The phelloderm are the parenchyma cells, which are derived from the phellogen.