Question

The electron source for the Chemolithoheterotrophs type of microorganism is:

• A. Sunlight
• B. COâ‚‚
• C. Reduced inorganic compounds
• D. Organic carbon

Hint:

Chemolithoheterotrophs use inorganic compounds such as hydrogen sulfide (H₂S) or ammonia (NH₃) as electron sources.

Answer 1

The Correct Option is C

Let's analyze each option:
(1) Sunlight: Sunlight is the energy source for phototrophs, not for chemolithoheterotrophs. Hence, this is not the correct answer.
(2) CO₂: CO₂ is used by autotrophs as a carbon source. Chemolithoheterotrophs do not use CO₂ directly as an electron source. Hence, this is not the correct answer.
(3) Reduced inorganic compounds: Chemolithoheterotrophs obtain electrons from reduced inorganic compounds, such as hydrogen sulfide (H₂S), ammonia (NH₃), or other inorganic compounds. This is the correct answer.
(4) Organic carbon: Organic carbon is used by heterotrophs. Chemolithoheterotrophs rely on inorganic compounds for their electron source. Hence, this is not the correct answer.
Conclusion: The correct answer is Option 3: Reduced inorganic compounds as chemolithoheterotrophs obtain their electrons from reduced inorganic compounds.