Giving examples, differentiate between photosynthetic and chemosynthetic bacteria

Giving examples, differentiate between photosynthetic and chemosynthetic bacteria.

• Photosynthetic bacteria manufacture carbohydrates from hydrogen sulphide, carbon dioxide using light energy. Example is cyanobacteria

(H₂S) as electron donor instead of water

CO₂ + 2H₂S  →   C(H₂O) + 2S

They do not give off oxygen

• Chemosynthetic bacteria manufacture carbohydrates from water and carbon dioxide using energy from oxidation of chemicals such as ammonia. Example is nitosomonas, iron bacteria, hydrogen bacteria

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