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Consider the following statements:
Methanogens are bacteria that produce methane by growing aerobically on cellulosic material.
  • Biogas is a mixture of gases predominantly containing methane.
  • Methanogens play an important role in the nutrition of cattle.
    Which of the statements given above is/are correct?
    • a)
      1 and 2 only
    • b)
      1 and 3 only
    • c)
      2 and 3 only
    • d)
      1, 2 and 3
    Correct answer is option 'C'. Can you explain this answer?
    Verified Answer
    Consider the following statements: Methanogens are bacteria that p...
    Option c is correct.
    • Statement 1 is incorrect: Methanogens are microbes that produce methane by growing anaerobically ( not aerobically) on cellulosic material. In addition to methane, some amounts of Carbon dioxide and Hydrogen gas are also produced. One such microbe is Methanobacterium. Methanogens belong to the domain archaea, which is distinct from bacteria. Both bacteria and Archaea are prokaryotic organisms.
    • Statement 2 is correct: Biogas is a mixture of gases predominantly containing methane. It is produced by the microbial activity and may be used as fuel.
    • Statement 3 is correct: Methonogens like Methanobacterium are present in the rumen of (a part of stomach) of cattle. A lot of cellulosic material present in the food of cattle is also present in the rumen. In rumen, these microbes help in the breakdown of cellulose and play an important role in the nutrition of cattle. Thus, the excreta of cattle (dung) is rich in these microbes. Dung can be used for generation of biogas, commonly called gobar gas. These Methanogens are also found in the anaerobic sludge during sewage treatment.
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    Most Upvoted Answer
    Consider the following statements: Methanogens are bacteria that p...
    Explanation:
    Statement 1:
    - Correct
    - Methanogens are bacteria that produce methane by growing anaerobically, not aerobically, on organic material such as cellulose. They are essential in the process of anaerobic digestion, which breaks down organic matter to produce biogas, which contains methane.
    Statement 2:
    - Correct
    - Biogas is indeed a mixture of gases, with methane being the predominant component. Methane is produced during the anaerobic digestion process by methanogenic bacteria, including methanogens.
    Statement 3:
    - Incorrect
    - Methanogens do not play a direct role in the nutrition of cattle. However, the methane produced by methanogens in the digestive system of ruminant animals like cattle can be a significant source of greenhouse gas emissions.
    Therefore, the correct statements are 2 and 3 only.
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    Consider the following statements: Methanogens are bacteria that produce methane by growing aerobically on cellulosic material. Biogas is a mixture of gases predominantly containing methane. Methanogens play an important role in the nutrition of cattle. Which of the statements given above is/are correct?a)1 and 2 onlyb)1 and 3 onlyc)2 and 3 onlyd)1, 2 and 3Correct answer is option 'C'. Can you explain this answer?
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    Consider the following statements: Methanogens are bacteria that produce methane by growing aerobically on cellulosic material. Biogas is a mixture of gases predominantly containing methane. Methanogens play an important role in the nutrition of cattle. Which of the statements given above is/are correct?a)1 and 2 onlyb)1 and 3 onlyc)2 and 3 onlyd)1, 2 and 3Correct answer is option 'C'. Can you explain this answer? for UPSC 2025 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements: Methanogens are bacteria that produce methane by growing aerobically on cellulosic material. Biogas is a mixture of gases predominantly containing methane. Methanogens play an important role in the nutrition of cattle. Which of the statements given above is/are correct?a)1 and 2 onlyb)1 and 3 onlyc)2 and 3 onlyd)1, 2 and 3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for UPSC 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements: Methanogens are bacteria that produce methane by growing aerobically on cellulosic material. Biogas is a mixture of gases predominantly containing methane. Methanogens play an important role in the nutrition of cattle. Which of the statements given above is/are correct?a)1 and 2 onlyb)1 and 3 onlyc)2 and 3 onlyd)1, 2 and 3Correct answer is option 'C'. Can you explain this answer?.
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