A common structural feature of vessel element | vedclass

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(A) $Xylem$ is the principal water-conducting tissue of the plant. It consists of four types of cells: tracheids,vessels,xylem fibres,and xylem parenc

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enucleate condition

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(A) $Xylem$ is the principal water-conducting tissue of the plant. It consists of four types of cells: tracheids,vessels,xylem fibres,and xylem parenchyma.$Xylem$ vessels are hollow,elongated cells with open ends and pitted walls. Cell walls are lignified. At maturity,the nucleus is absent in vessels.The constituent cells of the phloem are sieve elements (sieve cells,sieve tubes),companion cells,phloem fibres,and phloem parenchyma cells.Sieve tube members are long,slender,tube-like cells joined end-to-end to form long tubular channels called sieve tubes. Sieve tube members possess specialized sieve areas on the end walls called sieve plates. Young sieve tube members have abundant cytoplasm,but there is no nucleus. The nucleus disintegrates during their development.Therefore,the common feature between mature vessel elements and mature sieve tube elements is the absence of a nucleus (enucleate condition).

$A$ common structural feature of vessel elements and sieve tube elements is

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