Explain roots, stems and leaves in plants.

Roots

Primary Growth of Roots: Growth in Length

A major use of the finalize is the adjudicate roof; the calm down pennant is the masking on the end that protects the ontogeny root. Cells in the root cap atomic number 18 aware of the direction of gravity and direct the root growth accordingly. As the root grows the outer cells of the root cap gradually get scraped off, as to be expected when growing in the rough obscenity particles. Another function of the root cap is to support the apical meristem. The apical meristem is the site where cells fraction and produce new cells for both the root and root cap. supra the apical meristem is the zone of elongation. In the zone of elongation cells classify more slowly and grow long pushing the root cap and apical meristem through the soil. Above the zone of elongation is the zone of maturation. As the name might suggest, cells have reached their mount size and they develop into specialized cells.

Primary Structure of Roots

The structure of grow is do up of primary tissues, the shell, root hairs, the cerebral cortex, the endodermis and the pericycle. Primary tissues are formed from cells laid down by the apical meristems activity. The epidermis is the outermost point; its one cell thick and its hardened around the root.



Root hairs are extensions that grow out among the soil particles. The function of the root hairs is to anchor the plant into the soil and d increase surface area to absorb water and minerals. The cortex is most of the roots main tissue; its a thick stage of ground tissue just inside the epidermis. The cortex is made up of parenchyma cells which contain amyloplasts that store starch. The endodermis is a single layer of cells at the inner...

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