For each molecule of glucose formed in plants, the number of molecules of ATP and `NADPH_2` required , respectively. are

Options

A. 12 and 18
B. 18 and 12
C. 15 and 18
D. 3 and 22

Answer

To solve the question regarding the number of ATP and NADPH2 molecules required for the formation of one molecule of glucose in plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Glucose Formation**:
- The chemical formula for glucose is C6H12O6, which means it contains 6 carbon atoms. To form one glucose molecule, plants need to fix carbon dioxide (CO2).

2. **Carbon Dioxide Requirement**:
- Each glucose molecule requires 6 molecules of CO2. This is a key point because the fixation of carbon dioxide is essential in the process of photosynthesis.

3. **ATP and NADPH2 Production**:
- During the Calvin cycle, which is the process that synthesizes glucose, ATP and NADPH2 are used.
- For every 6 CO2 molecules that are fixed, a specific number of ATP and NADPH2 molecules are required.

4. **Calculating ATP and NADPH2**:
- It is known that for every molecule of glucose produced, the requirements are:
- **ATP**: 18 molecules
- **NADPH2**: 12 molecules

5. **Conclusion**:
- Therefore, for the formation of one molecule of glucose, the number of molecules of ATP and NADPH2 required are 18 and 12, respectively.

### Final Answer:
For each molecule of glucose formed in plants, the number of molecules of ATP and NADPH2 required, respectively, are 18 ATP and 12 NADPH2.