Question

Which of the following processes cannot take place in the absence of oxygen?

• A. Combustion
• B. Respiration
• C. Oxidation
• D. All of these

Answer 1

The correct option is D All of these

A. Combustion is the burning of any substance in presence of oxyen.

B. Respiration is the process involving the production of energy, by the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances

C. Oxidation is the addition of oxygen to the subsatnce.

So all the process involves the presence of oxygen.

Hence option D is correct.