Question

The experiment material used by Van Neil, to prove that O comes out from water was studied on

• A. Chlorella pyrenoidosa
• B. Cladophora
• C. purple & green sulphur bacteria
• D. blue green algae

Answer 1

Answer: (C)

purple & green sulphur bacteria

Answer 2

By studying purple sulphur bacteria and green sulphur bacteria, Cornelius Van Niel was the first scientist to demonstrate that photosynthesis is a light-dependent redox reaction in 1931, in which hydrogen from an oxidizable compound reduces carbon dioxide to cellular materials. This can be expressed as: 2 HA + CO $\to$ 2A + CHO + HO, where A is the electron acceptor. His discovery predicted that HO is the hydrogen donor in green plant photosynthesis and is oxidized to O.