This section contains Assertion and Reason type question. Each question has 4 choices (1),(2), (3) and (4), out of which only one is correct.
Assertion (A) Global warming is due to `CO_2`.
Reason (R ) Green plants require `O_2` and in turn they emit `CO_2` in photosynthesis.

Options

A. Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion
C. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect

Answer

To solve the Assertion and Reason type question, we will analyze both the assertion and the reason step by step.

### Step 1: Analyze the Assertion
**Assertion (A): Global warming is due to CO₂.**

- **Explanation**: Carbon dioxide (CO₂) is a greenhouse gas that traps heat in the Earth's atmosphere. When sunlight reaches the Earth, some of it is reflected back into space, but CO₂ absorbs some of this heat and re-emits it, causing the Earth to warm. This phenomenon is known as the greenhouse effect, and it is a significant contributor to global warming.

### Step 2: Analyze the Reason
**Reason (R): Green plants require O₂ and in turn they emit CO₂ in photosynthesis.**

- **Explanation**: This statement is incorrect. During photosynthesis, green plants take in carbon dioxide (CO₂) and water (H₂O) and, using sunlight and chlorophyll, convert them into glucose (C₆H₁₂O₆) and oxygen (O₂). Thus, plants actually emit O₂ and not CO₂ during this process. The statement in the reason misrepresents the process of photosynthesis.

### Step 3: Conclusion
- **Assertion (A)** is correct: Global warming is indeed due to CO₂.
- **Reason (R)** is incorrect: Green plants do not require O₂; they produce O₂ and consume CO₂ during photosynthesis.

### Final Answer
The correct option is (3): Assertion is correct, but Reason is incorrect.

---