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(A) Cornelius van Niel conducted pioneering studies on purple and green sulphur bacteria.He demonstrated that photosynthesis is a light-dependent reac

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(A) Cornelius van Niel conducted pioneering studies on purple and green sulphur bacteria.He demonstrated that photosynthesis is a light-dependent reaction in which hydrogen from a suitable oxidizable compound reduces carbon dioxide to carbohydrates.In these bacteria,hydrogen sulphide $(H_2S)$ acts as the hydrogen donor instead of water $(H_2O)$,and sulphur or sulphate is produced as an oxidation product instead of oxygen $(O_2)$.By comparing this with the process in green plants,he inferred that in green plants,$H_2O$ is the hydrogen donor and $O_2$ is evolved as a byproduct,not $CO_2$.

$A$ milestone contribution to the understanding of photosynthesis was made by Cornelius van Niel,which was based on the studies of

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