`C_(4)`plants can go on photosynthesizing even in

Options

A. Lesser `CO_(2)` level
B. Lesser salts level
C. Lesser water level
D. Lesser light intensity

Answer

### Step-by-Step Solution:

1. **Understanding C4 Plants**: C4 plants are specialized plants that utilize a unique photosynthetic pathway known as the Hatch and Slack pathway. This pathway allows them to efficiently fix carbon dioxide even under conditions that would inhibit other plants.

2. **Photosynthesis Mechanism**: In the Hatch and Slack pathway, two types of cells are involved: mesophyll cells and bundle sheath cells. The mesophyll cells initially capture carbon dioxide, while the bundle sheath cells are where the Calvin cycle occurs, leading to sugar production.

3. **Adaptation to Conditions**: C4 plants are adapted to high temperatures and can thrive in environments with lower levels of carbon dioxide (CO2). This adaptation is crucial for their survival in arid and hot climates.

4. **Role of Rubisco**: In C4 plants, the enzyme Rubisco is present in the bundle sheath cells. Rubisco can facilitate photosynthesis even when CO2 levels are low. Unlike C3 plants, which are more sensitive to CO2 levels, C4 plants can utilize oxygen when CO2 is scarce, allowing them to continue photosynthesis.

5. **Evaluating Options**:
- **Lesser CO2 Level**: C4 plants can photosynthesize effectively in lower CO2 levels due to their specialized pathways. This is the correct answer.
- **Lesser Salt Level**: Salt levels do not significantly affect the photosynthesis of C4 plants, so this option is incorrect.
- **Lesser Water Level**: While water is essential for photosynthesis, C4 plants have adaptations that allow them to tolerate lower water levels, but this does not directly relate to their ability to photosynthesize.
- **Light Intensity**: C4 plants can perform photosynthesis under varying light conditions, but this is not the primary factor that allows them to continue photosynthesis in challenging environments.

6. **Conclusion**: The correct answer is that C4 plants can continue photosynthesizing even in conditions of lesser CO2 levels.