Pigments are organised into two discrete photochemical light harvesting complexes within the PSI and PS II These are named in

Options

A. The sequence of discovery
B. Which they funcation in light reaction
C. The sequence of arrangment of chlorophylls
D. More than one option is correct

Answer

**Step-by-Step Solution:**

1. **Understanding Photosystems**: Photosystems are large complexes of proteins and pigments that play a crucial role in the light reactions of photosynthesis. There are two main types: Photosystem I (PSI) and Photosystem II (PSII).

2. **Identifying the Characteristics of PSI and PSII**:
- **Photosystem I (PSI)**:
- Maximum absorbance at 700 nm.
- Reaction center known as P700.
- **Photosystem II (PSII)**:
- Maximum absorbance at 680 nm.
- Reaction center known as P680.

3. **Sequence of Discovery**:
- PSI was discovered first, which is why it is referred to as PS I.
- PSII was discovered later, hence the name PS II.

4. **Analyzing the Options Given**:
- **Sequence of Discovery**: This option is correct because it reflects the order in which PSI and PSII were discovered.
- **Function in Light Reaction**: This is incorrect as PSII functions first in the light reaction, followed by PSI.
- **Sequence of Arrangement of Chlorophylls**: This is also incorrect as it does not pertain to the naming of the photosystems.
- **More than One Option is Correct**: This is incorrect since only one option (sequence of discovery) is valid.

5. **Conclusion**: The pigments organized into the two discrete photochemical light harvesting complexes within PSI and PSII are named in the sequence of their discovery.

**Final Answer**: The correct answer is the sequence of discovery.

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