Question

Chemosynthetic bacteria obtain energy from

• A. Infrared rays
• B. Inorganic chemicals
• C. Organic substances
• D. Sun

Answer 1

The correct option is B Inorganic chemicals

Sunlight :

Chemosynthetic bacteria lack photosynthetic pigments. Thus, they cannot absorb sunlight to perform photosynthesis.

Infrared rays :

Chemosynthetic bacteria cannot absorb infrared rays to obtain energy.

Organic substances:

Chemosynthetic bacteria synthesize organic substances from the oxidation of inorganic substances to obtain energy.

Inorganic substances :

Chemosynthetic bacteria obtain energy from inorganic chemicals such as carbon dioxide and hydrogen sulfide to synthesize organic substances. Thus, by the oxidation of inorganic substances, they obtain energy in the form of $ATP$.

Final answer

Inorganic substances.