ATP responsible for fixing `CO_2` and synthesis of sugar , is produced in the

Options

A. Lumen of thylakoid
B. Inside the thylakoid membrane
C. stroma of chloroplast
D. Cytosol of cell

Answer

To answer the question: "ATP responsible for fixing CO2 and synthesis of sugar is produced in the...", we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding the Role of ATP**:
- ATP (Adenosine Triphosphate) is a crucial energy carrier in cells. It provides the necessary energy for various biochemical processes, including the fixation of carbon dioxide (CO2) and the synthesis of sugars during photosynthesis.

2. **Identifying the Processes Involved**:
- The fixation of CO2 occurs during the Calvin cycle, which is part of photosynthesis. This cycle takes place in the chloroplasts of plant cells.

3. **Locating the Site of ATP Production**:
- Photosynthesis occurs in two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle).
- The light-dependent reactions occur in the thylakoid membranes of the chloroplasts and produce ATP and NADPH.
- The Calvin cycle, which uses ATP to fix CO2 and synthesize sugars, occurs in the stroma of the chloroplasts.

4. **Conclusion**:
- Since the question specifically asks about where ATP is produced that is responsible for fixing CO2 and synthesizing sugars, the correct answer is the **stroma of chloroplasts**. This is where the Calvin cycle takes place and ATP is utilized for sugar synthesis.

### Final Answer:
The ATP responsible for fixing CO2 and synthesis of sugar is produced in the **stroma of chloroplasts**.

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