Explanation:

• A root hair, or absorbent hair, is a hair-forming cell on the epidermis of a plant root.
• As they are lateral extensions of a single cell and only rarely branched, they are visible to the naked eye and light microscope.
• They are found only in the region of maturation of the root.
• Plants absorb water from the soil by osmosis. Root hair cells are adapted for this by having a large surface area to speed up osmosis.
• Another adaptation that they have is root hair cells have a large permanent vacuole.