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(D) The correct answer is $D$. In mature angiosperms,sieve tube elements are specialized conducting cells that lose their nuclei at maturity to facili

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Sieve tubes

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(D) The correct answer is $D$. In mature angiosperms,sieve tube elements are specialized conducting cells that lose their nuclei at maturity to facilitate the efficient transport of food materials (phloem sap). While they possess a nucleus during their early developmental stage,it degenerates as they mature,leaving them with only a thin layer of cytoplasm and a large central vacuole.

Column-$I$	Column-$II$
$P$. Parenchyma	$I$. No thickening
$Q$. Collenchyma	$II$. Pectin thickening
$R$. Sclerenchyma	$III$. Lignin thickening

The only plant cells without nuclei among the following are

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Conductive function is performed by

In plants,long distance transport of organic and inorganic substances occurs through

Match the following columns:

Column-$I$ Column-$II$

$P$. Parenchyma $I$. No thickening

$Q$. Collenchyma $II$. Pectin thickening

$R$. Sclerenchyma $III$. Lignin thickening

Assertion: In angiosperms,the conduction of water is more efficient because their xylem has vessels.
Reason: Conduction of water by vessel elements is an active process with energy supplied by xylem parenchyma rich in mitochondria.

Collenchyma tissue is present in

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