Oxygen during photosynthesis comes from water was proved by `O^(18)` experiment

Options

A. Ruben and Kamen
B. Hill
C. Warburg
D. Blackman

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the experiment that proved that the oxygen released during photosynthesis originates from water, specifically referencing the O^(18) experiment.

2. **Identifying the Scientists**: The experiment was conducted by scientists named Ruben and Kamen. They are the key figures associated with this discovery.

3. **Experimental Setup**: Ruben and Kamen used water (H2O) and carbon dioxide (CO2) in their experiment. They labeled the oxygen atoms in both water and carbon dioxide with a heavy isotope of oxygen, O^(18).

4. **Conducting the Experiment**: In the experiment, they tracked the labeled oxygen atoms during the process of photosynthesis. They monitored which source (water or carbon dioxide) contributed to the oxygen released.

5. **Observations**: After the completion of photosynthesis, they found that the oxygen released was labeled with O^(18) from the water, but not from the carbon dioxide. This indicated that the oxygen produced during photosynthesis came from water.

6. **Conclusion**: Based on their findings, Ruben and Kamen concluded that the oxygen released during photosynthesis is derived from water, not from carbon dioxide.

7. **Final Answer**: The correct answer to the question is that the experiment proving this was conducted by Ruben and Kamen.

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