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Why the cells of sclerenchyma and trache...

Why the cells of sclerenchyma and tracheids become dead?

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Tracheids & mature Sclerenchyma cells become dead due to the excessive secondary cell wall thickening composed of lignin. Due to this, the cell wall becomes hard & impermeable to water & other components essential for cell metabolism. Eventually, the cytoplasm is last, leaving lumen in centre.
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