Question

Why the cells of sclerenchyma and tracheids become dead?

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Answer 1

Explanation:

Due to lignification, the cells cannot exchange the material with outside environment i.e important nutrients cannot enter and harmful substances cannot leave the cell. Due to which these cells lose their living characters at maturity and become dead.

Answer 2

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Sclerenchyma, in plants, supports tissue composed of any of various kinds of hard woody cells. Mature sclerenchyma cells are usually dead cells that have heavily thickened secondary walls containing lignin. The sclerenchyma cells have a thick cell wall that is composed of the primary wall and a secondary wall. The primary wall is made up of cellulose while the secondary wall is made up of lignin. The process that involves the formation of the secondary wall is known as lignification. Due to lignification, the cells cannot exchange the material with the outside environment i.e important nutrients cannot enter and harmful substances cannot leave the cell. Due to which these cells lose their living characters at maturity and become dead.