Respiration in cephalochordates occurs through

Options

A. General body surface
B. Gills
C. Tracheole
D. Lungs

Answer

**Step-by-Step Solution:**

1. **Identify the Organism Group**: The question is about respiration in cephalochordates, which are a subphylum of the phylum Chordata. They are also known as lancets or amphioxus.

2. **Understand the Characteristics of Cephalochordates**: Cephalochordates are marine segmented animals that possess a notochord, a dorsal hollow nerve cord, and pharyngeal slits. These features are important for their classification and understanding their biology.

3. **Examine the Options for Respiration**: The options provided are:
- A) General body surface
- B) Gills
- C) Tracheal
- D) Lungs

4. **Analyze Each Option**:
- **General Body Surface**: Cephalochordates do not have specialized respiratory organs. They primarily respire through their general body surface, where gas exchange occurs directly with the surrounding water.
- **Gills**: Although cephalochordates have structures that resemble gills, these are mainly used for feeding rather than respiration.
- **Tracheal**: This system is specific to insects in the phylum Arthropoda and is not applicable to cephalochordates.
- **Lungs**: Lungs are respiratory organs found in mammals, not in cephalochordates.

5. **Conclusion**: Based on the analysis, the correct answer is that respiration in cephalochordates occurs through the general body surface.

**Final Answer**: A) General body surface

---