Question

Assertion (A): Nitrosomonas is a Chemoautotrophic bacteria.
Reason (R): Chemoautotrophs derive energy from sunlight and carbon from CO\(_2\).

• A. A and R are Correct and R is the Correct explanation of A
• B. A and R are Correct and R is not the Correct explanation of A
• C. A is Correct but R is incorrect
• D. A is incorrect but R is correct

Hint:

It's important to distinguish between different types of autotrophs: chemoautotrophs and photoautotrophs, based on their energy sources.

Answer 1

The Correct Option is C

To solve this problem, we need to analyze the assertion and reason provided and determine whether they are correct and if the reason correctly explains the assertion.

1. Understanding the Assertion [A]:
The assertion states that Nitrosomonas is a chemoautotrophic bacteria. This is true. Nitrosomonas is a type of bacteria that derives energy through the process of chemoautotrophy, which involves oxidizing inorganic substances like ammonia to obtain energy. It uses carbon dioxide (CO₂) as its carbon source, making it an autotroph.

2. Understanding the Reason [R]:
The reason provided is that chemoautotrophs derive energy from sunlight and carbon from CO₂. This is partly true but incomplete. Chemoautotrophs derive energy not from sunlight but from the oxidation of inorganic compounds, such as ammonia, nitrites, or sulfur compounds. They use CO₂ as their carbon source. The statement incorrectly mentions sunlight, which is characteristic of photoautotrophs, not chemoautotrophs.

3. Conclusion:
While the assertion is correct, the reason is only partially correct, as it incorrectly associates sunlight with chemoautotrophs instead of the correct source of energy (inorganic compounds). Therefore, the reason does not correctly explain the assertion.

Final Answer:
The correct answer is Option C: A is correct but R is incorrect.