Blood with corpuscles or plasma is absent in cockroach as

Options

A. Diffusion of gases takes place through integument
B. Exchange of gases occur through tracheae
C. Insects does not require oxygen
D. Blood only carries respiratory gases

Answer

**Step-by-Step Solution:**

1. **Understanding Cockroach Blood Composition**: In cockroaches, the blood is not composed of corpuscles (like red blood cells) or plasma as found in vertebrates. Instead, they have a fluid called hemolymph.

2. **Nature of Hemolymph**: Hemolymph is a colorless fluid that contains numerous white blood cells known as hemocytes. Unlike vertebrate blood, hemolymph does not contain respiratory pigments like hemoglobin, which is responsible for oxygen transport in vertebrates.

3. **Gaseous Exchange Mechanism**: Cockroaches and other insects do not rely on their blood for gas exchange. Instead, they have a specialized system of air tubes called tracheae that facilitate direct gas exchange.

4. **Direct Contact with Air**: The tracheae are branched air tubes that extend throughout the body, allowing every tissue to be in direct contact with atmospheric air. This means that oxygen can diffuse directly into the tissues without the need for a respiratory pigment in the blood.

5. **Spiracles**: The atmospheric air enters and exits the tracheal system through small openings called spiracles, which are located on the sides of the cockroach's body. This system is efficient for gas exchange, especially in terrestrial environments.

6. **Conclusion**: Therefore, the correct answer to the question is that "exchange of gases occurs through trachea," highlighting that the blood in cockroaches is not involved in gas transport like in vertebrates.