Question

Describe structure of root hair.

Answer 1

1. Root hair is a cytoplasmic extension (prolongation) of epiblema cell.
2. Each root hair may be approximately 1 to 10 mm long and tube-like structure.
3. It is colourless, unbranched, short-lived (ephemeral), and very delicate.
4. It has a large central vacuole surrounded by a thin film of cytoplasm, plasma membrane, and thin cell wall, which is two-layered.
5. Outer layer is composed of pectin and the inner layer is made up of cellulose.
6. Cell wall of a root hair is freely permeable but the plasma membrane is selectively permeable.