AP BIOLOGY

Detailed explanation-1: -Root hairs are tiny extensions or projections from the outer surface of plant roots. The outer layer of a plant cell is called epidermis, or epidermal cells; therefore, root hairs are considered epidermal cells.

Detailed explanation-2: -Root hair, or absorbent hairs, are outgrowths of epidermal cells, specialized cells at the tip of a plant root. They are lateral extensions of a single cell and are only rarely branched. They are found in the region of maturation, of the root.

Detailed explanation-3: -Root hair cells have long projections that increase the surface area that the plant can use to absorb water and minerals.

Detailed explanation-4: -Trichoblasts are the epidermal cells of roots that are capable of producing root hairs, whereas atrichoblasts are epidermal cells incapable of producing root hairs.

Detailed explanation-5: -The root hairs are where most water absorption happens. They are long and thin so they can penetrate between soil particles and they have a large surface area for absorption of water.