<Table> <Tr> <Td> </Td> <Td> This article does not cite any sources . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (December 2009) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article does not cite any sources . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (December 2009) (Learn how and when to remove this template message) </Td> </Tr> <P> 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 invisible to the naked eye . They are found only in the region of maturation of the root . Just prior to the root hair cell development, there is a point of elevated phosphorylase activity . </P> <P> 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 . 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 . </P>

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