Assertion : Long distance flow of photoassimi | vedclass

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(A) The assertion is correct because sieve tubes are the primary conducting elements for the translocation of photoassimilates (sucrose) in plants.The

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) The assertion is correct because sieve tubes are the primary conducting elements for the translocation of photoassimilates (sucrose) in plants.The reason is also correct because mature sieve tube elements lack a nucleus but retain a thin layer of parietal cytoplasm and possess perforated sieve plates at their end walls.These structural features facilitate the mass flow of sap from one sieve tube element to the next,making the reason a correct explanation for the assertion.

Column-$I$	Column-$II$
$i$. Radial translocation	$a$. Translocation of food from phloem to cortex
$ii$. Tangential translocation	$b$. Translocation of food from phloem to pith
$iii$. Longitudinal translocation	$c$. Translocation of food from source to sink

Assertion : Long distance flow of photoassimilates in plants occurs through sieve tubes.
Reason : Mature sieve tubes have parietal cytoplasm and perforated sieve plates.

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Match Column-$I$ with Column-$II$.
Column-$I$ Column-$II$
$i$. Radial translocation $a$. Translocation of food from phloem to cortex
$ii$. Tangential translocation $b$. Translocation of food from phloem to pith
$iii$. Longitudinal translocation $c$. Translocation of food from source to sink

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Assertion : Long distance flow of photoassimilates in plants occurs through sieve tubes.Reason : Mature sieve tubes have parietal cytoplasm and perforated sieve plates.