$A$: Carbohydrates are the primary source of energy in living organisms.
$R$: Glucose is the common substrate used in respiration.

  • A
    $A$ and $R$ are both true and $R$ is the correct explanation of $A$.
  • B
    $A$ and $R$ are both true,but $R$ is not the correct explanation of $A$.
  • C
    $A$ is true and $R$ is false.
  • D
    $A$ is false and $R$ is true.

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List-$I$ List-$II$
$(A)$ Glycolysis $(a)$ Mitochondria
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$(1)$ The $TCA$ cycle begins with the condensation of $OAA$ and water with $Acetyl-CoA$ to yield $Citric$ $acid$.
$(2)$ In fermentation,yeast converts glucose into ethanol under $Anaerobic$ conditions.

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