The `C_(4)` plants are different from `C_(3)` plants with reference to the

Options

A. Primary `CO_(2)` acceptor
B. End product of photosynthesis
C. Types of pigments involved in photosynthesis
D. Both end products of photosynthesis and types of photosynthetic pigments

Answer

To solve the question regarding the differences between C4 and C3 plants, we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding C3 and C4 Plants**:
- C3 plants utilize the Calvin cycle (C3 pathway) for carbon fixation.
- C4 plants utilize the Hatch-Slack pathway (C4 pathway) for carbon fixation.
- The primary difference lies in how they fix carbon dioxide and the products they generate.

2. **Identifying Primary CO2 Acceptors**:
- In C3 plants, the primary CO2 acceptor is Ribulose bisphosphate (RUBP).
- In C4 plants, the primary CO2 acceptor is Phosphoenolpyruvate (PEP).
- This indicates a fundamental difference in the initial step of carbon fixation.

3. **Examining End Products of Photosynthesis**:
- Both C3 and C4 plants ultimately produce glucose as the end product of photosynthesis.
- Therefore, the end products are not a distinguishing factor between the two types of plants.

4. **Types of Pigments Involved**:
- Both C3 and C4 plants contain chlorophyll and other pigments necessary for photosynthesis.
- Thus, the types of pigments involved do not differentiate C3 from C4 plants.

5. **Evaluating the Options**:
- **Option 1: Primary CO2 Accepted** - This is correct as it highlights the difference in CO2 acceptors (RUBP in C3 and PEP in C4).
- **Option 2: End Product of Photosynthesis** - Incorrect, as both produce glucose.
- **Option 3: Types of Pigments Involved in Photosynthesis** - Incorrect, as both types of plants have similar pigments.
- **Option 4: Both End Product of Photosynthesis and Types of Photosynthetic Pigments** - Incorrect for the same reasons as above.

6. **Conclusion**:
- The correct answer is **Option 1: Primary CO2 Accepted**, as it is the only option that accurately reflects a significant difference between C3 and C4 plants.