Component of ETC of mitochondira is

Options

A. Carotenoids
B. Plastocyanin
C. Phytochrome
D. Cytochrome oxidase.

Answer

To solve the question regarding the components of the electron transport chain (ETC) in mitochondria, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Electron Transport Chain (ETC)**:
- The ETC is a series of protein complexes located in the inner mitochondrial membrane. It plays a crucial role in cellular respiration by transferring electrons from electron donors to electron acceptors via redox reactions.

2. **Identifying the Options**:
- The options given are:
- a) Carotenoid
- b) Plastocyanin
- c) Phytochrome
- d) Cytochrome oxidases

3. **Analyzing Each Option**:
- **Carotenoid**: This is a pigment found in plants and does not play a role in the ETC.
- **Plastocyanin**: This is involved in photosynthesis in plants, specifically in the light reactions, and is not a component of the mitochondrial ETC.
- **Phytochrome**: This is a photoreceptor involved in plant responses to light and is not part of the ETC.
- **Cytochrome oxidases**: This is a key enzyme in the ETC that helps in the final transfer of electrons to oxygen, forming water.

4. **Conclusion**:
- Based on the analysis, the correct answer is **d) Cytochrome oxidases**. This enzyme is essential for the electron transport chain in mitochondria.

### Final Answer:
The component of the electron transport chain (ETC) of mitochondria is **cytochrome oxidases**.

---