The energy releasing metabolic process in which substrate is oxidised without an external electron acceptor is
A
Fermentation
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B
Aerobic respiration
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C
Photorespiration
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D
Glycolysis
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Solution
The correct option is C Glycolysis Cellular respiration aims at producing energy in the form of ATP and occurs in every living cell. The respiration starts with glycolysis, a stepwise process that oxidises respiratory substrate like glucose. Oxidation is in the form of removal of hydrogen and there is no external electron acceptor present.