Set of respiratory organs used for exchange of gases in terrestrial habitat is

Options

A. skin and gills
B. gills and trachea
C. trachea and lungs
D. lungs and ctenidia

Answer

To solve the question regarding the set of respiratory organs used for gas exchange in terrestrial habitats, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**: The question asks about respiratory organs specifically in terrestrial habitats, which include environments like forests, grasslands, and deserts.

2. **Identify the Options**: The options given are:
- A) Gills and skin
- B) Gills and trachea
- C) Trachea and lungs
- D) Lungs and senadia

3. **Analyze Each Option**:
- **Option A (Gills and skin)**: Gills are primarily found in aquatic organisms (like fish) and are not suitable for terrestrial habitats. Skin respiration is seen in some organisms like earthworms, but it is not a primary respiratory organ for most terrestrial animals.
- **Option B (Gills and trachea)**: Again, gills are not applicable to terrestrial organisms. Trachea is a respiratory organ found in insects, but this option is invalid due to the presence of gills.
- **Option C (Trachea and lungs)**: The trachea is the windpipe that connects the larynx to the lungs, and lungs are the primary respiratory organs in many terrestrial animals (like mammals). This option is valid for terrestrial habitats.
- **Option D (Lungs and senadia)**: Senadia (or spiracles) are respiratory structures in some invertebrates, but they are not typical for all terrestrial organisms. This option is less applicable compared to option C.

4. **Conclusion**: Based on the analysis, the only set of respiratory organs that are used for gas exchange in terrestrial habitats is the trachea and lungs.

5. **Final Answer**: Therefore, the correct answer is **Option C: Trachea and lungs**.