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Sieve tubes are characterized by having a peripheral cytoplasmic layer, lacking a nucleus, and being alive. Their cell walls are thicker compared to adjacent parenchyma cells. What are these structures?

1. Sieve tubes
2. Companion cells
3. Both sieve tubes and companion cells
4. None of these

Correct answer: Sieve tubes

Solution

Sieve tubes are living phloem elements that lack a nucleus at maturity and retain a thin peripheral layer of cytoplasm. Their walls are also thicker than those of adjacent parenchyma cells, matching the description exactly.

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