To reduce `1 CO_(2)` molecules in `C_(3)` cycle , assimilatory power needed is

Options

A. `3ATP, 2NPDPH_(2)`
B. `2ATP, 2NADPH_(2)`
C. `5 ATP, 2NADPH_(2)`
D. `6.5 ATP, 2NADPH_(2)`

Answer

To solve the question of how much assimilatory power is needed to reduce one CO₂ molecule in the C3 cycle, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the C3 Cycle**:
- The C3 cycle, also known as the Calvin cycle, is a series of biochemical reactions that occur in the stroma of chloroplasts during photosynthesis. It is responsible for fixing carbon dioxide into organic compounds.

2. **Identifying the Inputs**:
- In the C3 cycle, carbon dioxide (CO₂) is fixed and reduced to form glucose. This process requires energy and reducing power.

3. **Energy and Reducing Power Requirements**:
- To reduce one molecule of CO₂, the cycle utilizes ATP (adenosine triphosphate) for energy and NADPH (nicotinamide adenine dinucleotide phosphate) for reducing power.

4. **Calculating the Assimilatory Power Needed**:
- For the reduction of one CO₂ molecule in the C3 cycle, it is established that:
- **3 ATP molecules** are required.
- **2 NADPH molecules** are required.
- Therefore, the total assimilatory power needed to reduce one CO₂ molecule is 3 ATP and 2 NADPH.

5. **Conclusion**:
- The assimilatory power needed to reduce one CO₂ molecule in the C3 cycle is 3 ATP and 2 NADPH.

### Final Answer:
To reduce one CO₂ molecule in the C3 cycle, the assimilatory power needed is **3 ATP and 2 NADPH**.

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