Question

Who first indicated that water is electron donor in photosynthesis?

• A. Arnon
• B. Calvin
• C. Blakeslee
• D. Van Niel.

Answer 1

The correct option is D Van Niel.

Van Niel gives the postulation that in green plants, water is utilized in place of H${}_2$S and O${}_2$ is evolved in place of sulphur and indicated that water is an electron donor in photosynthesis and was confirmed by Ruben and Kamen in 1941.

$6C{O}_2+12H_{2}O\to C_6{H}_{12}{O}_6+6H_{2}O+6O_2$

So the correct option is 'Van Niel'.