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Question

Isotopes used in the photosynthetic experiments by scientists were
  1. C11 and P32.
  2. C15 and P32.
  3. C14 and O18.
  4. C16 and P15.

A
C15 and P32.
B
C16 and P15.
C
C11 and P32.
D
C14 and O18.
Solution
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Radioisotopes, like heavy isotopes of carbon (i.e., C14) and oxygen (i.e., O18) were used in photosynthesis. C14 labelled carbon dioxide was used by Calvin and coworkers to trace the path of carbon in dark reaction, whereas water containing O18 was used by Ruben and Kamen to confirm that the source of oxygen released in photosynthesis is water not carbon dioxide.

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