Assertion : `CO_2` is utilized in dark reaction of photosynthesis.
Reason : `CO_2` as one of the raw material enters the leaves through stomata.

Options

A. If both Assertion and Reason are true and Reason is correct explaination of Assertion.
B. If both Assertion and Reason are true but Reason is not correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If both Assertion and Reason are false.

Answer

To analyze the given assertion and reason, we can break down the solution into the following steps:

### Step 1: Understand the Assertion
The assertion states that "CO₂ is utilized in the dark reaction of photosynthesis."
- **Explanation**: This statement is true because during the dark reactions (Calvin cycle), carbon dioxide is fixed and converted into glucose using energy from ATP and NADPH produced in the light reactions.

### Step 2: Understand the Reason
The reason states that "CO₂ as one of the raw materials enters the leaves through stomata."
- **Explanation**: This statement is also true. Stomata are small openings on the leaf surface that allow gases to enter and exit. CO₂ enters the leaf through these stomata for use in photosynthesis.

### Step 3: Evaluate the Relationship Between Assertion and Reason
Now, we need to determine if the reason provided is a correct explanation for the assertion.
- **Analysis**: While both statements are true, the reason does not directly explain why CO₂ is utilized in the dark reactions. The reason simply states how CO₂ enters the leaves, but it does not explain its role in the dark reactions.

### Step 4: Choose the Correct Option
Based on the analysis:
- Both the assertion and reason are true, but the reason is not the correct explanation for the assertion. Therefore, the correct option is: "Both assertion and reason are true but reason is not a correct explanation of assertion."

### Final Answer
The correct option is: "Both assertion and reason are true but reason is not a correct explanation of assertion."

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