During photosynthesis. the site for light reaction is

Options

A. Stroma of the chloroplast
B. Thylakoids of the chloroplast
C. ds circular DNA of the chloroplast
D. Both (1) & (3)

Answer

**Step-by-Step Solution:**

1. **Understanding Photosynthesis**: Photosynthesis is a process by which green plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose. It occurs in two main stages: the light reactions and the dark reactions (Calvin cycle).

2. **Identifying the Light Reaction**: The light reaction, also known as the photochemical phase, occurs when sunlight is absorbed by chlorophyll and other pigments. This phase converts solar energy into chemical energy in the form of ATP and NADPH.

3. **Locating the Site of Light Reaction**: The light reactions take place in specific structures within the chloroplasts. The chloroplasts contain thylakoids, which are membrane-bound sacs that house chlorophyll.

4. **Thylakoids Structure**: Thylakoids are organized in stacks called grana. They are rich in chlorophyll, which is essential for capturing light energy. The high concentration of chlorophyll allows for efficient absorption of light.

5. **Conclusion**: Since the light reactions occur in the thylakoids of the chloroplasts, the correct answer to the question is that the site for the light reaction during photosynthesis is the **thylakoids of chloroplasts**.

**Final Answer**: The site for light reaction during photosynthesis is the thylakoids of chloroplasts.

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