Q99 / 200 · MHT CET - Medical 2026 (23 April Shift 2) · Biology
Which of the following processes adds $\text{CO}_2$ to the atmosphere?
- APhotosynthesis
- Correct answerBRespiration
- CCarboxylation.
- DNitrification.
Solution
Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water, thereby removing $\text{CO}_2$ from the atmosphere.
Respiration is a metabolic process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide, thus adding $\text{CO}_2$ to the atmosphere.
Carboxylation is a chemical reaction in which a carboxylic acid group is produced by treating a substrate with carbon dioxide, which consumes $\text{CO}_2$.
Nitrification is the biological oxidation of ammonia to nitrite followed by the oxidation of the nitrite to nitrate, which does not release $\text{CO}_2$.
Therefore, respiration is the process that adds $\text{CO}_2$ to the atmosphere.
Answer: Respiration
Respiration is a metabolic process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide, thus adding $\text{CO}_2$ to the atmosphere.
Carboxylation is a chemical reaction in which a carboxylic acid group is produced by treating a substrate with carbon dioxide, which consumes $\text{CO}_2$.
Nitrification is the biological oxidation of ammonia to nitrite followed by the oxidation of the nitrite to nitrate, which does not release $\text{CO}_2$.
Therefore, respiration is the process that adds $\text{CO}_2$ to the atmosphere.
Answer: Respiration
Hence, the correct answer is option: 'B'.