Question

The organisms that obtain energy from inorganic compounds are known as:

• A. Autotrophs
• B. Organotrophs
• C. Lithotrophs
• D. Phototrophs

Hint:

“Litho” = rock/mineral → Lithotrophs use inorganic compounds for energy.

Answer 1

The Correct Option is C

- Autotrophs fix carbon dioxide as their carbon source but do not necessarily get energy from inorganics.
- Organotrophs derive energy from organic compounds.
- Phototrophs use light as their energy source.
- Lithotrophs derive energy by oxidizing inorganic compounds (e.g., \(\ce{H2S}\), \(\ce{NH3}\), \(\ce{Fe^{2+}}\), \(\ce{H2}\)).
\(⇒\) Organisms obtaining energy from inorganics are called lithotrophs.
\fbox{Thus, the correct answer is (C).}