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Sieve tube cells of phloem tissue do not...

Sieve tube cells of phloem tissue do not possess nuclei in mature state. Still they remain alive. Give the reason.

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**Step-by-Step Solution:** 1. **Understanding Sieve Tube Cells**: Sieve tube cells are specialized cells found in the phloem tissue of plants. They are responsible for the transport of nutrients, particularly sugars, throughout the plant. 2. **Lack of Nuclei**: In their mature state, sieve tube cells do not possess nuclei. This is unusual for living cells, as the nucleus is typically essential for cell function and survival. 3. **Dependency on Companion Cells**: Despite lacking nuclei, sieve tube cells remain alive because they are closely associated with companion cells. Companion cells are living cells that have nuclei and perform vital functions. ...
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