The energy releasing metabolic process in which substrate is oxidized without an external electron acceptor is called as

Photorespiration

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Glycolysis

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Fermentation

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Aerobic respiration

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Solution

The correct option is D Fermentation
Fermentation is incomplete oxidation of food substances in absence of oxygen (external electron acceptor) into alcohol or lactic acid with the small amount of energy being released. Aerobic respiration uses oxygen as an electron acceptor for oxidation of substrates. Glycolysis is the first common stage of both fermentation and aerobic respiration. Photorespiration is oxidation of RuBP by enzyme RUBISCO and does not produce energy. Thus, the correct answer is option C.

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