Question

Beggiatoa, a bacterium depends on organic carbon, inorganic chemicals and inorganic electron donor for its nutrition. On the basis of its nutritional type, it is classified as

• A. Photoorganoheterotroph
• B. Chemolithoautotroph
• C. Chemolithoheterotroph
• D. Chemoorganoheterotroph

Hint:

Remember: - {“Chemo”} = energy from chemicals, - {“Litho”} = electrons from inorganic sources, - {“Heterotroph”} = carbon from organic sources. Use this to classify metabolic types quickly!

Answer 1

The Correct Option is C

Step 1: Understand the metabolic classification 
The prefix "chemo" means it obtains energy from chemical compounds (not light). 
"litho" indicates the electron donor is inorganic. 
"heterotroph" indicates it depends on organic carbon for its carbon source. 
Step 2: Apply this to Beggiatoa 
Beggiatoa uses inorganic chemicals as an electron donor $\Rightarrow$ litho 
It depends on organic carbon $\Rightarrow$ heterotroph 
Its energy is derived from chemical reactions $\Rightarrow$ chemo
Conclusion: Therefore, Beggiatoa is correctly classified as a Chemolithoheterotroph.