Blood does not transport `O_(2)` in

Options

A. Man
B. Frog
C. Cockroach
D. Pheretima

Answer

To solve the question "Blood does not transport O₂ in," we will analyze the options provided and determine which organism does not use blood to transport oxygen.

### Step-by-Step Solution:

1. **Identify the Organisms**: The options given are:
- A) Man (Human)
- B) Frog
- C) Cockroach
- D) Earthworm

2. **Understand Blood and Oxygen Transport**:
- In most vertebrates, including humans and frogs, blood contains hemoglobin, which is a protein that binds oxygen and transports it from the lungs to body tissues.
- Earthworms also have hemoglobin in their blood, allowing them to transport oxygen.

3. **Analyze the Cockroach**:
- Cockroaches belong to the group of insects, which have a different respiratory system compared to vertebrates.
- Cockroach blood is colorless and does not contain hemoglobin. Instead, it contains a different respiratory pigment called hemocyanin, which is not as efficient as hemoglobin in transporting oxygen.
- In cockroaches, oxygen is primarily transported through a system of tubes called tracheae, which directly deliver oxygen to tissues.

4. **Conclusion**:
- Since the cockroach does not use blood to transport oxygen (it relies on tracheal systems), the correct answer to the question is **C) Cockroach**.

### Final Answer:
The blood does not transport O₂ in **C) Cockroach**.

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