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(A) In $1930$,$C.B. Van Niel$ proved that purple and green sulphur bacteria use $H_2S$ (in place of water) and $CO_2$ to synthesize carbohydrates as f

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Van Niel

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(A) In $1930$,$C.B. Van Niel$ proved that purple and green sulphur bacteria use $H_2S$ (in place of water) and $CO_2$ to synthesize carbohydrates as follows:$6CO_2 + 12H_2S \xrightarrow{Light} C_6H_{12}O_6 + 6H_2O + 12S$This led $Van Niel$ to the postulation that in green plants,water $(H_2O)$ is utilized in place of $H_2S$ and $O_2$ is evolved as a byproduct in place of sulphur $(S)$. He indicated that water is the electron donor in photosynthesis.$6CO_2 + 12H_2O \xrightarrow{Light} C_6H_{12}O_6 + 6H_2O + 6O_2$

The scientist who proved that bacteria use $H_2S$ gas and $CO_2$ to synthesize carbohydrates is

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