What is true regarding PS-II ?

Options

A. It takes longer wavelength of light and electrons from `H_2O`
B. It takes shorter wavelength of light and electrons from `H_2O`
C. It takes longer wavelength of light and electrons from NADP
D. It takes shorter wavelength of light and electrons from NADP

Answer

**Step-by-Step Solution:**

1. **Understanding Photosystems**:
- Photosynthesis in higher plants involves two main photosystems: Photosystem I (PS-I) and Photosystem II (PS-II).
- PS-I is known as P700 because it absorbs light at a wavelength of 700 nanometers, while PS-II is known as P680 because it absorbs light at a wavelength of 680 nanometers.

2. **Identifying the Wavelengths**:
- PS-II absorbs light at a shorter wavelength (680 nm) compared to PS-I (700 nm). Therefore, any statement claiming that PS-II has a longer wavelength is incorrect.

3. **Source of Electrons**:
- PS-II takes electrons from water molecules (H2O). This process is known as photolysis, where water is split into oxygen, protons (H+), and electrons. The oxygen produced is released into the atmosphere.

4. **Evaluating Statements**:
- The statement "PS-II takes a longer wavelength of light" is false because PS-II absorbs light at a shorter wavelength (680 nm).
- The statement "PS-II takes electrons from NADP" is also false because PS-II does not accept electrons from NADP; it accepts them from water.
- The correct statement is that "PS-II takes a shorter wavelength of light (680 nm) and electrons from water molecules."

5. **Conclusion**:
- The true statement regarding PS-II is that it absorbs light at a shorter wavelength (680 nm) and takes electrons from water molecules.

**Final Answer**: PS-II absorbs light at a shorter wavelength (680 nm) and takes electrons from water molecules.

---