Which is not a function of blood in cockroach?

Options

A. Transport of nutrients
B. Transport of gases
C. Reservoir of water
D. Main hydrostatic pressure

Answer

To determine which function is not associated with blood in cockroaches, we need to analyze the roles of blood (or hemolymph) in their physiology.

### Step-by-Step Solution:

1. **Understanding Hemolymph**: In cockroaches, the circulating fluid is called hemolymph, which is different from blood in vertebrates. Hemolymph is a colorless fluid that plays various roles in the cockroach's body.

2. **Transport of Nutrients**: Hemolymph is responsible for transporting nutrients throughout the cockroach's body. This is a key function of hemolymph, as it helps distribute essential substances to various tissues.

3. **Transport of Gases**: Unlike vertebrates, cockroaches do not use hemolymph for gas exchange. Instead, they have a specialized respiratory system that includes tracheal tubes. These tubes directly deliver oxygen to cells and remove carbon dioxide from them. Therefore, hemolymph does not play a role in the transport of gases.

4. **Reservoir of Water**: Hemolymph also acts as a reservoir of water, helping to maintain hydration and support physiological functions in the cockroach.

5. **Hydrostatic Pressure**: Hemolymph contributes to maintaining hydrostatic pressure within the cockroach's body, which is important for movement and structural support.

6. **Conclusion**: Based on the analysis, the function that is NOT associated with blood (hemolymph) in cockroaches is the **transport of gases**. This is primarily handled by the tracheal system.

### Final Answer:
The function that is not associated with blood in cockroaches is the **transport of gases**.

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