define all kinds of protective tissue
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Protective tissues are usually present in the outermost layer of the plant body such as leaves, stem and roots and offer protection to the plant body. They prevent desiccation, mechanical injury, and infection in plants. Types of protective tissues: Epidermis. Cork.
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> Epidermis: It is the outer covering of cells in plants. It carries out protective function (protecting plants from some unfavorable conditions). It is generally made up of a single layer of cells. In arid habitats, the epidermis is thicker to protect the plant from undue loss of water.
> Cork: As plants grow big, a strip of secondary meristem known as cork cambium replaces the epidermis of the stem. It is a plain tissue with only one type of cell. The cork cambium gives off fresh cells on both sides, forming cork. These cells are lifeless with no intercellular spaces and are greatly thickened with suberin. Cork cells avert desiccation, infection, and mechanical injury.