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  4. In purple and green bacteria, oxygen is not evolved during photosynthesis because hydrogen donor is

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Q. In purple and green bacteria, oxygen is not evolved during photosynthesis because hydrogen donor is

AMUAMU 2014Photosynthesis in Higher Plants

Solution:

In purple and green bacteria, is $H_{2} S$ the hydrogen donor unlike green plants in which to $O_{2}$.
In case of $H_{2} S$, the oxidation product is sulphur or sulphate depending on the organism,