A) Calvin
B) Mayer
C) Blackman
D) Ruben, Hassid and Kamen
Correct Answer: D
Solution :
Ruben, Hassid and Kamen (1941) demonstrated that oxygen evolved during photosynthesis comes from water and not from carbondioxide. For this, they used water with heavy isotope of oxygen\[{{\,}^{\text{18}}}\text{O}\text{.}\] Calvin (1954-55) traced the pathway of carbon fixation by using \[{{\,}^{\text{14}}}\text{C}{{\text{O}}_{\text{2}}}\]and proposed the \[{{\text{C}}_{\text{3}}}\]cycle, so known as Calvin cycle. Calvin was awarded Nobel Prize for his work in 1960. Von Mayer (1845) demonstrated that green plants convert solar energy into chemical energy during the process of photosynthesis. Blackmann (1905) propounded the law or principle of limiting factors. He also proposed the occurrence of a dark phase in photosynthesis.
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