Light reaction takes place in

Options

A. Stroma
B. Grana
C. Both A and B
D. None of these

Answer

**Step-by-Step Solution:**

1. **Understanding Photosynthesis**: Photosynthesis is the process by which plants convert light energy into chemical energy in the form of carbohydrates. This process occurs in two main stages: the light reaction and the dark reaction.

2. **Identifying the Location of Photosynthesis**: Photosynthesis takes place in the chloroplasts of plant cells. Chloroplasts are double membrane-bound organelles that contain chlorophyll, the pigment responsible for capturing light energy.

3. **Distinguishing Between Light and Dark Reactions**:
- The light reaction occurs in the thylakoid membranes of the chloroplasts.
- The dark reaction (also known as the Calvin cycle) occurs in the stroma, which is the liquid portion of the chloroplast.

4. **Understanding the Thylakoid and Grana**: The thylakoids are organized into stacks called grana. It is in the thylakoid membranes where the light reaction takes place, utilizing light energy to produce ATP and NADPH.

5. **Conclusion**: Therefore, the light reaction takes place in the grana of the chloroplasts.

**Final Answer**: The light reaction takes place in the grana of the chloroplast.

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