Q94 / 200 · MHT CET - Medical 2026 (26 April Shift 1) · Biology
Which of the following is NOT the source of methane released to atmosphere?
- ACattle field
- BBio-gas plant
- CPaddy field
- Correct answerDFire extinguisher
Solution
Methane is a greenhouse gas that is naturally and anthropogenically released into the atmosphere.
Cattle fields are a major source of methane due to the enteric fermentation process in the digestive system of ruminants.
Bio-gas plants produce biogas, which is primarily composed of methane, through the anaerobic digestion of organic matter.
Paddy fields (flooded rice fields) are another significant source of methane because the waterlogged soil creates an ideal anaerobic environment for methanogenic bacteria.
Fire extinguishers typically contain carbon dioxide, dry chemicals, water, or foam to suppress fires. Methane is a highly flammable gas and is never used in fire extinguishers.
Therefore, fire extinguishers are not a source of methane.
Answer: Fire extinguisher
Cattle fields are a major source of methane due to the enteric fermentation process in the digestive system of ruminants.
Bio-gas plants produce biogas, which is primarily composed of methane, through the anaerobic digestion of organic matter.
Paddy fields (flooded rice fields) are another significant source of methane because the waterlogged soil creates an ideal anaerobic environment for methanogenic bacteria.
Fire extinguishers typically contain carbon dioxide, dry chemicals, water, or foam to suppress fires. Methane is a highly flammable gas and is never used in fire extinguishers.
Therefore, fire extinguishers are not a source of methane.
Answer: Fire extinguisher
Hence, the correct answer is option: 'D'.