Number of carboxylations in the photosynthesis in sorghum and maize is
(a) 1
(b) 2
(c) 3
(d) 4

Options

A. 1
B. 2
C. 3
D. 4

Answer

To determine the number of carboxylations in the photosynthesis of sorghum and maize, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Type of Plants**:
Sorghum and maize are classified as C4 plants.

2. **Understand C4 Photosynthesis**:
C4 plants utilize a unique photosynthetic pathway that involves two distinct types of cells: mesophyll cells and bundle sheath cells.

3. **Carboxylation Process**:
In C4 photosynthesis, the initial fixation of carbon dioxide occurs in the mesophyll cells. This is the first carboxylation step.

4. **Second Carboxylation**:
The fixed carbon is then transported to the bundle sheath cells, where a second carboxylation occurs. This is the second step in the carboxylation process.

5. **Total Carboxylations**:
Therefore, in sorghum and maize, there are a total of two carboxylation steps involved in the process of photosynthesis.

6. **Conclusion**:
Based on the above analysis, the correct answer to the question is (b) 2.

### Final Answer:
(b) 2