Question

Which of the following is an epidermal cell?

• A. Guard cells
• B. Root hairs
• C. Trichome
• D. All of the above

Answer 1

Answer: (D)

All of the above

• Epidermal cells form the outer covering or surface and are mainly involved in protection and secretion. Guard cells, root hairs, and trichome are all modification of the epidermal cells.
• (i) Root hair

Structure:

Unicellular hairs are the extensions of an epidermal cell of roots in the root hair zone.

Function:

It increases the surface area for absorption of water and minerals.

• (ii)Trichomes

Structure:

These are epidermal cell modifications. There may be unicellular or multicellular.

Functions:

Secretion and protection

• (iii) Guard cell

Structure:

These are bean-shaped cells present on the epidermis of the leaf.

Functions:

These regulate the opening and closing of stomatal pore.

Hence the correct option is D.