`C_(4)` Plants have higher net photosynthesis rate as they have

Options

A. No photorespiration
B. `PEP` as `CO_(2)` acceptor
C. Kranz anatomy
D. Photosynthesis even at low light intensity.

Answer

### Step-by-Step Solution:

1. **Understanding C4 Plants**: C4 plants are a group of plants that have a unique photosynthetic pathway. They are known for their efficiency in photosynthesis, especially in conditions where C3 plants may struggle.

2. **Key Features of C4 Plants**:
- **No Photorespiration**: One of the main reasons C4 plants have a higher net photosynthesis rate is that they do not undergo photorespiration. Photorespiration is a process that can occur in C3 plants when oxygen competes with carbon dioxide for the active site of the enzyme RuBisCO, leading to a loss of fixed carbon and energy.
- **PEP Carboxylase**: C4 plants use phosphoenolpyruvate (PEP) as their primary CO2 receptor. PEP carboxylase has a higher affinity for CO2 than RuBisCO, which allows C4 plants to effectively capture carbon dioxide even at low concentrations.

3. **Kranz Anatomy**: C4 plants exhibit a specialized leaf structure known as Kranz anatomy, which includes:
- Bundle sheath cells that surround the vascular bundles.
- Mesophyll cells that capture CO2 and convert it into a four-carbon compound (oxaloacetate), which is then transported to the bundle sheath cells where it is converted back into CO2 for the Calvin cycle.

4. **Photosynthesis at Low Light Intensity**: C4 plants can perform photosynthesis efficiently even at lower light intensities due to their specialized anatomy and biochemical pathways, which allow them to concentrate CO2 around RuBisCO and minimize photorespiration.

5. **Conclusion**: The higher net photosynthesis rate in C4 plants compared to C3 plants can be attributed primarily to the absence of photorespiration, the use of PEP as a CO2 acceptor, and their unique Kranz anatomy.

### Final Answer:
C4 plants have a higher net photosynthesis rate primarily because they have no photorespiration.

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