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  4. The ultimate electron acceptor of respiration in an aerobic organism is

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Q. The ultimate electron acceptor of respiration in an aerobic organism is

Respiration in Plants

Solution:

The electron transport chain catalyses an electron flow from $NADH\, (FADH_2)$ to oxygen, which is the final electron acceptor of the respiratory process. It produces water in the mitochondrial matrix.
$NADH + H^{+} \rightleftharpoons NAD^{+} + 2H^{+}+2e^{-}$
$FADH_{2} \rightleftharpoons FAD + 2H^{+} + 2e^{-}$
$\frac{1}{2}O_{2} + 2H^{+} + 2e^{-} \to H_{2}O$