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.

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

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