In which following example chlorophyll a/b ratio is minimum

Options

A. LHC
B. ETS
C. PSI
D. PS II

Answer

To determine in which example the chlorophyll a/b ratio is minimum, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Chlorophyll Types**:
- Recognize that chlorophyll comes in various types, primarily chlorophyll a and chlorophyll b. Chlorophyll a is the primary pigment involved in photosynthesis, while chlorophyll b assists in capturing light energy.

2. **Identify the Context**:
- The question asks about the chlorophyll a/b ratio in different components of the photosynthetic apparatus, specifically in the context of light harvesting complexes and photosystems.

3. **Analyze the Options**:
- The options provided are:
- LHC (Light Harvesting Complex)
- ETS (Electron Transport System)
- PS1 (Photosystem 1)
- PS2 (Photosystem 2)

4. **Evaluate Chlorophyll Ratios**:
- Generally, different components have varying ratios of chlorophyll a to b:
- **LHC**: Typically has a higher ratio of chlorophyll b to a, as it captures light energy.
- **PS1**: Contains more chlorophyll a, leading to a higher a/b ratio.
- **PS2**: Also contains a significant amount of chlorophyll a but has a relatively lower ratio compared to PS1.
- **ETS**: Does not contain chlorophyll; it is involved in the transfer of electrons.

5. **Conclusion**:
- Among the options, **PS2** has the minimum chlorophyll a/b ratio compared to the others because it has a higher proportion of chlorophyll a relative to chlorophyll b.

### Final Answer:
The chlorophyll a/b ratio is minimum in **PS2 (Photosystem 2)**.

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