The active component of photosystem-I is composed of

Options

A. chlorophyll-a with absorption peak at 680 nm
B. chlorophyll-a with absorption peak at 700 nm
C. chlorophyll-b with absorption peak at 680 nm
D. chlorophyll-a and chlorophyll-b with absorption peak ay 700 nm

Answer

To answer the question regarding the active component of photosystem-I, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Photosystem-I**: Understand that photosystem-I (PSI) is a crucial component of the photosynthetic process, particularly in the light-dependent reactions.

2. **Locate the Reaction Center**: The reaction center of photosystem-I is where the primary photochemical reactions occur. This is essential for the conversion of light energy into chemical energy.

3. **Identify the Primary Electron Acceptor**: In photosystem-I, the primary electron acceptor is known as P700. This component is critical as it absorbs light energy and initiates the electron transport chain.

4. **Understand the Composition of the Reaction Center**: The reaction center of photosystem-I contains two chlorophyll molecules. These chlorophyll molecules are responsible for absorbing light.

5. **Specify the Type of Chlorophyll**: The two chlorophyll molecules present in the reaction center are both forms of chlorophyll A. They are specifically referred to as chlorophyll A and chlorophyll A', and they have an absorption peak at 700 nanometers.

6. **Conclusion**: Therefore, the active component of photosystem-I is composed of chlorophyll A, which absorbs light at the wavelength of 700 nanometers.

### Final Answer:
The active component of photosystem-I is composed of chlorophyll A with an absorption peak at 700 nanometers.

---