Read the following statements regarding Calvin cycle.
`CO_2` is assimilated into sugars.
RuBP is regenerated.
ATP and NADPH are found.
Select the correct option.

Options

A. I and II
B. II and III
C. I and III
D. All of these

Answer

To determine the correct statements regarding the Calvin cycle, let's analyze each statement step by step.

### Step-by-Step Solution:

1. **Understanding the Calvin Cycle**:
- The Calvin cycle is a crucial part of photosynthesis that occurs in the stroma of chloroplasts in plants and algae. It is responsible for converting carbon dioxide (CO₂) from the atmosphere into glucose (sugar) using energy from ATP and NADPH produced in the light-dependent reactions.

2. **Analyzing the First Statement**:
- **Statement**: "CO₂ is assimilated into sugars."
- **Explanation**: This statement is true. During the Calvin cycle, CO₂ is fixed and then reduced to form glucose and other carbohydrates. This process is essential for the synthesis of sugars that serve as energy sources for the plant and, ultimately, for other organisms.

3. **Analyzing the Second Statement**:
- **Statement**: "RuBP is regenerated."
- **Explanation**: This statement is also true. At the end of the Calvin cycle, ribulose bisphosphate (RuBP) is regenerated, allowing the cycle to continue. This regeneration is crucial for the cycle to function repeatedly.

4. **Analyzing the Third Statement**:
- **Statement**: "ATP and NADPH are found."
- **Explanation**: This statement is true as well. ATP and NADPH are produced in the light-dependent reactions of photosynthesis and are used in the Calvin cycle to convert CO₂ into glucose. They provide the necessary energy and reducing power for the reactions in the cycle.

5. **Conclusion**:
- All three statements regarding the Calvin cycle are correct. Therefore, the correct option would include all of these statements.

### Final Answer:
All statements regarding the Calvin cycle are correct:
1. CO₂ is assimilated into sugars.
2. RuBP is regenerated.
3. ATP and NADPH are found.