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Which plant tissue is responsible for providing mechanical support and how ?

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Sclerenchyma . It consists of thick walled dead cells. These cells have hard and extremely thick secondary walls due to uniform deposition of lignin. This lignin deposition is so thick that the cell walls become strongs, rigid and inpermeable to water. The cell lumen becomes very narrow or nearly absent. These cells are cemented with the help of conspicuous middle lamella,a wall that lies between the adjacent cells and made up of pectin, lignin and protein.

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