In cockroach, oxygen is carried to tissue by

Options

A. Hemoglobin
B. Respiratory pigment
C. Tracheal tubes
D. Diffusion through integument

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks how oxygen is transported to tissues in a cockroach.

2. **Identifying Options**: The options provided include:
- Hemoglobin
- Respiratory pigment
- Tracheal tubes
- Diffusion through integuments

3. **Analyzing Hemoglobin**:
- Hemoglobin is a protein found in the blood of many animals, including humans, and is responsible for transporting oxygen.
- In cockroaches, hemoglobin is absent. Therefore, this option is incorrect.

4. **Considering Respiratory Pigment**:
- Respiratory pigments are substances that carry oxygen in the blood.
- Cockroaches do not have any respiratory pigments. Thus, this option is also incorrect.

5. **Evaluating Tracheal Tubes**:
- Cockroaches have a unique respiratory system that includes tracheal tubes.
- These tubes are specialized structures that directly transport oxygen from the environment to the tissues.
- Therefore, this option is correct.

6. **Examining Diffusion through Integuments**:
- Diffusion through integuments refers to the process where oxygen passes through the skin or outer covering of an organism.
- While some organisms can use this method, cockroaches primarily rely on their tracheal system for respiration, making this option incorrect.

7. **Conclusion**: Based on the analysis, the correct answer is that oxygen is carried to tissues in cockroaches by **tracheal tubes**.

**Final Answer**: Oxygen is carried to tissues in cockroaches by **tracheal tubes**.

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