Which of the following is the respiratory pigment in human ?

Options

A. Phytochrome
B. Cytochrome
C. Haemoglobin
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the respiratory pigment found in humans. Respiratory pigments are molecules that transport oxygen in the blood.

2. **Identifying the Options**: The options given are:
- Option 1: Phytochrome
- Option 2: Cytochrome
- Option 3: Hemoglobin
- Option 4: None of the above

3. **Analyzing Each Option**:
- **Phytochrome**: This is a plant pigment involved in the regulation of plant growth and development, not found in humans.
- **Cytochrome**: These are proteins involved in electron transport and cellular respiration but are not the primary respiratory pigment in humans.
- **Hemoglobin**: This is a protein found in red blood cells (RBCs) that binds to oxygen in the lungs and transports it to tissues throughout the body.
- **None of the above**: This option is incorrect since hemoglobin is indeed a respiratory pigment.

4. **Conclusion**: The correct answer is **Hemoglobin** because it is the primary respiratory pigment in humans responsible for oxygen transport.

**Final Answer**: Hemoglobin

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