Respiratory organs of insect is

Options

A. moist cuticle
B. trachecal tubes
C. body surface
D. gills

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the respiratory organs of insects. To answer this, we need to identify the specific structures that facilitate respiration in insects.

2. **Identifying Insect Respiratory Structures**: Insects have specialized respiratory organs that differ from those of vertebrates. The primary respiratory structures in insects are:
- **Tracheal Tubes**: These are the main respiratory organs in insects. They are a network of tiny tubes that transport air directly to the tissues.
- **Spiracles**: These are small openings located on the body surface of insects that allow air to enter the tracheal system. They also help in regulating water loss.
- **Moist Cuticle**: While not a primary respiratory organ, the moist cuticle helps prevent desiccation (loss of moisture), which is crucial for the overall functioning of the respiratory system.

3. **Eliminating Incorrect Options**:
- **Body Surface**: Although the body surface can participate in gas exchange, it is not a primary respiratory organ.
- **Gills**: Gills are not present in insects; they are primarily found in aquatic organisms like fish. Therefore, this option is incorrect.

4. **Conclusion**: The primary respiratory organs of insects are the **tracheal tubes** and **spiracles**. These structures work together to facilitate the exchange of gases (oxygen and carbon dioxide) necessary for respiration.

**Final Answer**: The respiratory organs of insects are the **tracheal tubes** and **spiracles**.

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