Question

Match List - I with List - II.

List - I	List - II
A. Autotrophic aerobe B. Autotrophic anaerobe C. Heterotrophic aerobe D. Heterotrophic anaerobe	I. Azotobacter II. Rhodospirillum III. Methanococcus IV. Nostoc

• A. A-IV, B-II, C-III, D-I
• B. A-IV, B-III, C-II, D-I
• C. A-IV, B-II, C-I, D-III
• D. A-IV, B-I, C-II, D-III

Hint:

Remember that 'autotrophic' refers to organisms that can use carbon dioxide, while 'heterotrophic' means they require organic compounds. Also, 'aerobe' requires oxygen, whereas 'anaerobe' does not.

Answer 1

The Correct Option is C

Step 1: Concept
Microbial metabolism and respiration

Step 2: Meaning
Understanding the metabolic types of different microorganisms in relation to their oxygen requirements.

Step 3: Analysis
A. Autotrophic aerobe requires carbon dioxide as a carbon source and uses oxygen for respiration. B. Autotrophic anaerobe also requires carbon dioxide as a carbon source but does not use oxygen for respiration. C. Heterotrophic aerobe uses organic compounds as a carbon source and requires oxygen for respiration. D. Heterotrophic anaerobe uses organic compounds as a carbon source but does not require oxygen for respiration.

Step 4: Conclusion
Given the characteristics of each microorganism in List - II, they can be matched with their corresponding metabolic types in List - I as follows: A-IV (Nostoc) is an autotrophic aerobe, B-III (Methanococcus) is an autotrophic anaerobe, C-II (Rhodospirillum) is a heterotrophic aerobe, D-I (Azotobacter) is a heterotrophic aerobe. Final Answer: (C)