Question

Which of the following are specialized epidermal cells of the plant?

• A.
  Guard cells
• B.
  Trichomes
• C. Tracheids
• D.
  Root hairs

Answer 1

Answer: (A), (B), (D)

Root hairs
The epidermis is the basic plant's outermost cell layer. Epidermal cells are firmly attached to one another and provide the plant with mechanical strength and protection. Cutin is found in the epidermal cells of plants' above-ground portions, which are covered by a cuticle. Guard cells are specialised epidermal cells that operate to open microscopic holes in the plant surface, allowing carbon dioxide from the external atmosphere to diffuse into the chlorenchyma tissue for photosynthesis. Trichomes are epidermal protuberances found on the plant's aerial sections that protect it from excessive transpiration, extreme temperatures, and other factors. Root hair, also known as absorbent hairs, are tubular outgrowths of a root's epidermal cell, a hair-forming cell on the epidermis. These structures are only rarely branching lateral expansions of a single cell.