Are seive tube dead at maturity

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Solution

No,

Unlike the water-conducting xylem vessel elements that are dead when mature, sieve elements are living cells. They are unique in lacking a nucleus at maturity.
1)Sieve tubes are actually cell which lack nucleus at maturity.

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Are seive tube dead at maturity

No, Unlike the water-conducting xylem vessel elements that are dead when mature, sieve elements are living cells. They are unique in lacking a nucleus at maturity. 1)Sieve tubes are actually cell which lack nucleus at maturity.

No,

Unlike the water-conducting xylem vessel elements that are dead when mature, sieve elements are living cells. They are unique in lacking a nucleus at maturity.
1)Sieve tubes are actually cell which lack nucleus at maturity.