Nucleus is absent in

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(A) The $Sieve$ $tube$ $elements$ are specialized cells of the phloem tissue that lack a nucleus at maturity. They possess thin cellulosic walls and r

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Sieve tube

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(A) The $Sieve$ $tube$ $elements$ are specialized cells of the phloem tissue that lack a nucleus at maturity. They possess thin cellulosic walls and remain living despite the absence of a nucleus,as their metabolic functions are regulated by the adjacent companion cells. In contrast,$Cambium$ cells and $Phloem$ $parenchyma$ cells retain their nuclei throughout their functional life.

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