With respect to compensation point, which of the following is true for `C_3` and `C_4` plants

Options

A. Compensation points of `C_3` and `C_4` plants are equal
B. Compensation points of `C_3` is higher than `C_4` plants
C. Compensation point of `C_4` the plant is higher than `C_3` plant
D. None of the above

Explanation

### Step-by-Step Solution:

1. **Understanding Compensation Point**:
- The compensation point is defined as the point at which the rate of photosynthesis equals the rate of respiration in a plant. At this point, there is no net exchange of gases; the amount of carbon dioxide used in photosynthesis is equal to the amount of carbon dioxide released during respiration.

2. **C3 Plants Characteristics**:
- In C3 plants, the enzyme Rubisco can bind with both carbon dioxide and oxygen. When it binds with oxygen, a process called photorespiration occurs, which results in the release of carbon dioxide and the consumption of ATP without producing glucose. This leads to a lower efficiency in carbon fixation and a higher compensation point.

3. **C4 Plants Characteristics**:
- C4 plants utilize a different pathway for carbon fixation. They employ the enzyme PEP carboxylase, which has a higher affinity for carbon dioxide and does not bind with oxygen. This reduces the occurrence of photorespiration, allowing C4 plants to maintain a lower compensation point as they can fix carbon dioxide more efficiently and produce glucose at a higher rate.

4. **Comparison of Compensation Points**:
- Given the differences in how C3 and C4 plants handle carbon dioxide and respiration, it can be concluded that the compensation point for C3 plants is higher than that of C4 plants. This is because C3 plants experience more photorespiration, leading to a greater release of carbon dioxide and a higher overall compensation point.

5. **Conclusion**:
- Therefore, the correct statement regarding the compensation points of C3 and C4 plants is: "The compensation point of C3 is higher than that of C4 plants."

### Final Answer:
The compensation point of C3 plants is higher than that of C4 plants.

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