Which one of the following equation suggests that `O_(2)` released during photosynthesis comes from water?

Options

A. `6CO_(2)^(18)+12H_(2)Orarr6O_(2)^(18)+C_(6)H_(12)O_(6)+6H_(2)O^(18)`
B. `6CO_(2)+12H_(2)O^(18)+rarr6O_(2)+C_(6)H_(12)O_(6)+6H_(2)O^(18)`
C. `6CO_(2)^(18)+12H_(2)Orarr6O_(2)^(18)+C_(6)H_(12)O_(6)+6H_(2)O`
D. `6CO_(2)+12H_(2)O^(!8)rarr6O_(2)^(18)+C_(6)H_(12)O_(6)+6H_(2)O`

Explanation

To determine which equation suggests that the oxygen released during photosynthesis comes from water, we need to analyze the given options. Here’s a step-by-step solution:

### Step 1: Understand the Process of Photosynthesis
Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy, using carbon dioxide and water. During this process, oxygen is released as a byproduct.

### Step 2: Identify the Source of Oxygen
The key point in the question is to identify the source of the oxygen released. Research, particularly by scientists like Ruben and Kamen, has shown that the oxygen released during photosynthesis originates from water molecules, not from carbon dioxide.

### Step 3: Analyze the Given Equations
We need to look at the equations provided in the options (not listed here) and determine which one indicates that the oxygen released comes from water.

1. **Equation with Normal Water and Radioactive CO2**: This would suggest that the oxygen released is from CO2.
2. **Equation with Radioactive Water and Normal CO2**: This indicates that the oxygen released is from water, as the water is labeled as radioactive.
3. **Other combinations**: Any equations that do not involve water as a source of oxygen can be ruled out.

### Step 4: Select the Correct Equation
Based on the understanding that the oxygen released during photosynthesis comes from water, the correct equation would be the one that uses radioactive water (H2O) and normal carbon dioxide (CO2). This indicates that the oxygen released is derived from the water molecules.

### Conclusion
The correct answer is the equation that involves radioactive water, which suggests that the oxygen released during photosynthesis comes from water.

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