Question

Green sulfur bacteria use H2S as an electron donor for photosynthesis. Write an equation that describes photosynthesis in these organisms

Short answer

The equation for photosynthesis in green sulfur bacteria is:

$C{O}_2+2H_{2}S+lightenergy\to C{H}_{2}O+2S+H_{2}O$.

Step-by-step solution

Definition of photosynthesis

Photosynthesis is a process in which light energy is converted into chemical energy to synthesize food material in plants. During photosynthesis, green sulfur bacteria employ $H_{2}S$ instead of water as an electron donor.

An equation for photosynthesis in green sulfur bacteria

$C{O}_2+2H_{2}S+lightenergy\to C{H}_{2}O+2S+H_{2}O$

The green sulfur bacteria utilize the light energy and (electron donor) to fix the carbon dioxide gas. The resulting products include ethanol, water, and sulfur.