In the circulatory system of cockroach the function of haemolymh is to

Options

A. transport `O_2 `
B. transport `CO_2`
C. transport food
D. transport air

Answer

**Step-by-Step Solution:**

1. **Understanding the Circulatory System of Cockroach**: The circulatory system of a cockroach is open, meaning that the blood (hemolymph) is not always contained within blood vessels. Instead, it bathes the organs directly.

2. **Identifying the Components of Hemolymph**: Hemolymph is the fluid that circulates in the cockroach's body. It contains nutrients, hormones, and waste products.

3. **Analyzing the Functions of Hemolymph**: The primary functions of hemolymph include:
- Transporting nutrients (food) to various parts of the body.
- Helping in the immune response.
- Assisting in the removal of waste products.

4. **Eliminating Incorrect Options**:
- **Option A (Transport O2)**: Cockroaches do not use hemolymph for oxygen transport; instead, they have a tracheal system for gas exchange.
- **Option B (Transport CO2)**: Similar to oxygen, carbon dioxide is also transported via the tracheal system, not hemolymph.
- **Option D (Transport air)**: Hemolymph does not transport air; air is delivered directly to tissues through the tracheal system.

5. **Conclusion**: The correct function of hemolymph in the circulatory system of a cockroach is to transport food. Therefore, the answer is **Option C (Transport food)**.

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