A: Nutritional mutant strain of pink mould is | vedclass

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(A) An auxotroph is a mutant organism that has lost the ability to synthesize a specific essential nutrient (such as an amino acid or vitamin) require

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

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(A) An auxotroph is a mutant organism that has lost the ability to synthesize a specific essential nutrient (such as an amino acid or vitamin) required for its growth.Because it cannot synthesize these metabolites from basic raw materials,it must be supplied with the specific nutrient in its growth medium.Pink mould,such as $Neurospora$ $crassa$,is a classic model organism used in genetics to study such nutritional mutants.Therefore,both the assertion and the reason are correct,and the reason provides the correct explanation for why the strain is termed an auxotroph.

$A$: Nutritional mutant strain of pink mould is auxotroph.
$R$: It is not able to prepare its own metabolites from the raw materials obtained from outside.

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$A$: Nutritional mutant strain of pink mould is auxotroph.$R$: It is not able to prepare its own metabolites from the raw materials obtained from outside.