Question : Why the cells of sclerenchyma and tracheids become dead?

1.	Question : Why the cells of sclerenchyma and tracheids become dead?
Answer» Solution :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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