Question

Carbon is found in all organic material. It is used by plants to form organic molecules but most carbon is found in the atmosphere as carbon dioxide. Which of the following processes releases carbon dioxide back into the atmosphere?
I. Decomposition
II. Respiration
Ill. Combustion

• A. I only
• B. II only
• C. I and Ill only
• D. II and III only
• E. I, II and III

Answer 1

The correct option is E I, II and III

I. Decomposition is the process of breakdown of complex organic materials by microorganisms which also results in the release of carbon dioxide.

II. Respiration is the process by which energy is derived by the oxidation of various complex substances accompanied by the release of carbon dioxide.

III. Combustion is the burning of a substance in presence of air. It also releases carbon dioxide into the air.

Hence all these processes release carbon dioxide back into the atmosphere.

So, the correct answer is 'I, II and III'.