Question

The hydrogen donor in bacterial photosynthesis is usually

• A. Water
• B. Hydrogen sulphide
• C. Sulphuric acid
• D. Ammonia

Answer 1

The correct option is B Hydrogen sulphide

Photosynthetic bacteria perform bacterial photosynthesis in a similar way to plants. They contain light-harvesting pigments, absorb carbon dioxide and release oxygen in presence of sunlight. However, in bacterial photosynthesis, the hydrogen donor is usually hydrogen sulphide. The elemental sulphur is released unlike oxygen in plant photosynthesis. The photosynthetic bacterial includes cyanobacteria.

Thus, the correct answer is 'Hydrogen sulphide.'