Question:
In the following reaction ‘X’ stands for
\[
\text{CO}_2 + 2\text{NADPH}_2 + 2\text{ATP} \rightarrow (\text{CH}_2\text{O}) + X + 2\text{NADP} + 2\text{ADP} + 2\text{iP}
\]
In the following reaction ‘X’ stands for
\[ \text{CO}_2 + 2\text{NADPH}_2 + 2\text{ATP} \rightarrow (\text{CH}_2\text{O}) + X + 2\text{NADP} + 2\text{ADP} + 2\text{iP} \]
\[ \text{CO}_2 + 2\text{NADPH}_2 + 2\text{ATP} \rightarrow (\text{CH}_2\text{O}) + X + 2\text{NADP} + 2\text{ADP} + 2\text{iP} \]
Show Hint
Released oxygen in photosynthesis comes from water, not CO$_2$.
Updated On: Mar 6, 2026
- O$_2$
- H$_2$O
- CO$_2$
- ATP
Show Solution
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The Correct Option is A
Solution and Explanation
Step 1: Identifying the reaction.
The given reaction represents the reduction of carbon dioxide during photosynthesis.
Step 2: Source of oxygen.
Oxygen is released during the light reaction due to photolysis of water.
Step 3: Overall photosynthesis.
Although CO$_2$ is reduced to carbohydrate, O$_2$ is released as a by-product.
Step 4: Conclusion.
Hence, ‘X’ in the reaction stands for oxygen (O$_2$).
The given reaction represents the reduction of carbon dioxide during photosynthesis.
Step 2: Source of oxygen.
Oxygen is released during the light reaction due to photolysis of water.
Step 3: Overall photosynthesis.
Although CO$_2$ is reduced to carbohydrate, O$_2$ is released as a by-product.
Step 4: Conclusion.
Hence, ‘X’ in the reaction stands for oxygen (O$_2$).
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