A: Restitutional nucleus can be observed in e | vedclass

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(D) The statement $A$ is incorrect because a restitutional nucleus is typically observed in the tapetum cells,not the endothecium cells. During the de

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Assertion is correct,but Reason is incorrect.

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(D) The statement $A$ is incorrect because a restitutional nucleus is typically observed in the tapetum cells,not the endothecium cells. During the development of the microsporangium,tapetal cells often undergo endomitosis or nuclear fusion,leading to polyploidy and the formation of a restitutional nucleus.The statement $R$ is also incorrect because endothecium cells are diploid $(2n)$ in nature,derived from the primary parietal layer of the microsporangium. They are not triploid $(3n)$.Therefore,both Assertion and Reason are incorrect.

Column-$I$ (Organisms)	Column-$II$ (Chromosome number in meiocytes)
$P$. Housefly	$I$. $38$
$Q$. Rat	$II$. $42$
$R$. Dog	$III$. $12$
$S$. Cat	$IV$. $78$
$T$. Fruit fly	$V$. $8$

Column-$I$	Column-$II$
$A$. Tapetum	$i$. Degenerate during development
$B$. Intine	$ii$. Resistant organic materials
$C$. Vegetative cell	$iii$. Pollen tube
$D$. Sporopollenin	$iv$. Provide nourishment to pollen grains

$A$: Restitutional nucleus can be observed in endothecium cells.
$R$: Endothecium cells are usually triploid.

Similar Questions

Which of the following plants produce seeds and possess a pollen tube?

Match the following columns:
Column-$I$ (Organisms) Column-$II$ (Chromosome number in meiocytes)
$P$. Housefly $I$. $38$
$Q$. Rat $II$. $42$
$R$. Dog $III$. $12$
$S$. Cat $IV$. $78$
$T$. Fruit fly $V$. $8$

Differentiate between Stamen and Pistil.

Make the correct pair:

Column-$I$ Column-$II$

$A$. Tapetum $i$. Degenerate during development

$B$. Intine $ii$. Resistant organic materials

$C$. Vegetative cell $iii$. Pollen tube

$D$. Sporopollenin $iv$. Provide nourishment to pollen grains

If the root of a flowering plant has $24$ chromosomes,then how many chromosomes does its gamete have?

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$A$: Restitutional nucleus can be observed in endothecium cells.$R$: Endothecium cells are usually triploid.