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 can break it down into the following steps:

### Step 1: Understand the Carbon Fixation Process
- C3 plants primarily use the Calvin cycle for carbon fixation. The primary carbon dioxide acceptor in C3 plants is Ribulose bisphosphate (RuBP).
- C4 plants, on the other hand, utilize a different pathway for carbon fixation known as the C4 pathway. The primary carbon dioxide acceptor in C4 plants is Phosphoenolpyruvate (PEP).

### Step 2: Identify the First Stable Product
- In C3 plants, the reaction of CO2 with RuBP, facilitated by the enzyme Rubisco, produces a 3-carbon compound called 3-phosphoglycerate (PGA).
- In C4 plants, the reaction of CO2 with PEP, facilitated by the enzyme phosphoenolpyruvate carboxylase, produces a 4-carbon compound called oxaloacetic acid (OAA).

### Step 3: Compare the End Products of Photosynthesis
- Both C3 and C4 plants ultimately produce glucose as the end product of photosynthesis, but the initial products of carbon fixation differ.

### Step 4: Evaluate the Types of Pigments Involved
- The types of pigments involved in photosynthesis (like chlorophyll a, chlorophyll b, and carotenoids) are generally similar in both C3 and C4 plants.

### Conclusion
- The main difference between C3 and C4 plants lies in their primary carbon dioxide acceptor. C3 plants use RuBP, while C4 plants use PEP.

### Final Answer
The C4 plants are different from C3 plants with reference to the **primary carbon dioxide acceptor**.

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