Assertion (A) : In photosynthetic bacteria, photosynthesis is anoxygenic i.e., without liberation of $O_{2}$
Reason (R) : In photosynthetic bacteria hydrogen donor is $H_{2} S$

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A is correct but R is incorrect.

Both A & R are incorrect.

Both A and R are correct, but R is not a correct explanation of A.

Both A & R are correct. R is the correct explanation of A.

answer is A.

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Detailed Solution

A milestone contribution to the understanding of photosynthesis was that made by a microbiologist, Cornelius van Niel (1897-1985), who, based on his studies of purple and green bacteria, demonstrated that photosynthesis is essentially a light-dependent reaction in which hydrogen from a suitable oxidisable compound reduces carbon dioxide to carbohydrates.

In green plants H2O is the hydrogen donor and is oxidised to O2 . Some organisms do not release O2 during photosynthesis. When H2 S, instead is the hydrogen donor for purple and green sulphur bacteria, the ‘oxidation’ product is sulphur or sulphate depending on the organism and not O2 .

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