Question

Why is the root hair unicellular ?

Answer 1

Hair is unicellular because it is made up of keratin which is just a protein giving strength

Answer 2

Hey....
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Here is your answer......

A root hair , or absorbent hair , the rhizoid of a
vascular plant , is a tubular outgrowth of a trichoblast, 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. They are found only in the region of maturation of the root. Just prior to, and during, root hair cell development, there is elevated phosphorylase activity.

The root hairs are where most water absorption happens. They are long and thin so they can penetrate between soil particles, and prevent harmful bacterial organisms from entering the plant through the xylem vessels. They have a large surface area for absorption of water. Increasing root surface area aids plants to be more efficient in absorbing nutrients and establishing relationships with microbes. Cross-section of root hair cell: a roughly rectangular shape with a long, thin tail extending to the right and a nucleus at the top left. Water passes from the soil water to the root hair cell’s cytoplasm by osmosis. This happens because the soil water has a higher water potential than the root hair cell cytoplasm. The function of root hairs is to collect water and mineral nutrients present in the soil and take this solution up through the roots to the rest of the plant. As root hair cells do not carry out photosynthesis they do not contain chloroplasts .
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