PS-II is physically located on

Options

A. Inner side of the membrane of the thylakoid
B. Outer side of the membrane of the thylakoid
C. Middle of the membrane of the thylakoid
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Understanding Photosystem II (PS-II):**
- Photosystem II is one of the two photosystems involved in the process of photosynthesis. It is primarily responsible for the absorption of light energy and the splitting of water molecules to release oxygen.

2. **Identifying the Wavelength:**
- PS-II is associated with chlorophyll that absorbs light at a wavelength of 680 nm. This is an important characteristic that helps in identifying its role in photosynthesis.

3. **Location of PS-II:**
- PS-II is located in the thylakoid membranes of chloroplasts. Specifically, it is found on the inner side of the thylakoid membrane.

4. **Reason for Location:**
- The inner side of the thylakoid membrane is where the chlorophyll molecules are concentrated, allowing for effective light absorption and subsequent energy transfer processes necessary for photosynthesis.

5. **Exclusion of Other Options:**
- The outer side of the thylakoid membrane does not contain PS-II, as it would not be effective for photosynthesis. Similarly, the middle membrane of the thylakoid has a reduced form of chlorophyll and is not the primary location for PS-II.

6. **Conclusion:**
- Therefore, the correct answer is that Photosystem II (PS-II) is physically located on the inner side of the thylakoid membrane.

**Final Answer:**
Photosystem II (PS-II) is physically located on the inner side of the thylakoid membrane.

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