Assertion : Dark reaction of photosynthesis uses ATP and `NADPH_(2)`
Reason : Dark reaction takes place in absence of light.

Options

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A and R are false

Answer

To solve the question, we need to analyze both the assertion and the reason provided:

**Assertion:** Dark reaction of photosynthesis uses ATP and NADPH₂.
**Reason:** Dark reaction takes place in absence of light.

### Step-by-Step Solution:

1. **Understanding Dark Reactions:**
- Dark reactions, also known as the Calvin cycle, occur in the stroma of chloroplasts.
- They utilize ATP and NADPH₂, which are produced during the light-dependent reactions (light reactions) of photosynthesis.

2. **Analyzing the Assertion:**
- The assertion states that dark reactions use ATP and NADPH₂. This is true because these molecules are essential for the conversion of carbon dioxide into glucose during the Calvin cycle.

3. **Understanding the Reason:**
- The reason states that dark reactions take place in the absence of light. While it is true that dark reactions do not require light directly, they can occur in the presence of light as well. Therefore, this statement is misleading because it implies that dark reactions can only occur when there is no light, which is not accurate.

4. **Conclusion:**
- The assertion is true, while the reason is false. Thus, the correct relationship is that the assertion is correct, but the reason does not accurately explain the assertion.

### Final Answer:
- The assertion is true, and the reason is false. Therefore, the correct option is **C**.

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