In........plants, the `CO_(2)` compensation point is usually much higher than in.....plants.

Answer

**Step-by-Step Solution:**

1. **Understanding CO2 Compensation Point:**
- The CO2 compensation point is the level of carbon dioxide concentration at which the rate of photosynthesis equals the rate of respiration in plants. At this point, there is no net exchange of CO2.

2. **Identifying Plant Types:**
- There are different types of plants based on their photosynthetic pathways, primarily C3 and C4 plants.
- C3 plants use the Calvin cycle for photosynthesis, while C4 plants have a modified pathway that allows them to efficiently fix CO2 even at lower concentrations.

3. **Comparing CO2 Compensation Points:**
- C3 plants typically have a higher CO2 compensation point compared to C4 plants. This is due to the higher rates of photorespiration in C3 plants, which occurs when oxygen competes with CO2 for the active site of the enzyme RuBisCO.

4. **Conclusion:**
- Therefore, the answer to the question is: In C3 plants, the CO2 compensation point is usually much higher than in C4 plants.

**Final Answer:**
In C3 plants, the CO2 compensation point is usually much higher than in C4 plants.

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