Assertion (A) : Methanogenic archae (methanogens) grow in swamps and sewage.
Reason (R) : Methanogens are obligate anaerobes
Choose the correct answer :
Methanogen Assertion Reason Analysis
Step 1: Evaluate Assertion (A)
- Assertion (A) states that methanogenic archae (methanogens) grow in swamps and sewage.
- Swamps and sewage are known environments characterized by the absence or very low levels of oxygen.
- Methanogens are indeed microorganisms found thriving in such anoxic conditions.
- Therefore, Assertion (A) is correct.
Step 2: Evaluate Reason (R)
- Reason (R) states that methanogens are obligate anaerobes.
- Obligate anaerobes are organisms that cannot survive in the presence of oxygen.
- Methanogens exclusively use anaerobic pathways for energy metabolism, primarily producing methane.
- Therefore, Reason (R) is correct.
Step 3: Determine if (R) explains (A)
- The environments mentioned in Assertion (A) (swamps and sewage) are anaerobic.
- Reason (R) correctly identifies methanogens as obligate anaerobes.
- The anaerobic nature of methanogens (R) is the direct reason why they inhabit and grow in anaerobic environments like swamps and sewage (A).
- Therefore, Reason (R) provides the correct explanation for Assertion (A).
Conclusion
Both Assertion (A) and Reason (R) are correct statements, and Reason (R) serves as the valid explanation for Assertion (A).
Important Questions from Applied Ecology
Which one of the following was recently reported to be the first mammal to have become extinct as a result of climate change?
Given below is a list of natural disturbances.
A. Coral bleaching
B. Rising sea levels
C. Shifts in species distribution
D. Lowering of sea levels
E. Increase in glacial sheets
Which one of the following combinations of disturbances can be attributed to global warming?
The following information refers to ecological interactions.
Which one of the following options represents the correct match between column X and column Y?Column X Column X A Bass introduction into
aquatic systems(i) Bioaccumulation B Beavers (ii) Aposematism C Sea bird (such as puffins) (iii) Keystone species D Yellow and black stripes in a wasp (iv) Trophic cascades Which one of the options given below is NOT desirable when setting up nature reserves in the tropics?
A researcher captured 45 fish from a lake on day 1, tagged and released them back. On day 2 the researcher caught 50 fish out from the same lake, of which 15 were already tagged. Estimate the population size of fish in the lake with this information and pick the correct option.
