Air bladder is present in

Options

A. Star fishes
B. Chondrichthyes
C. Actinopterygii
D. Flying fishes

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where the air bladder is present. We need to identify which among the given options contains an air bladder.

2. **Analyzing the Options**:
- **Starfishes**: These are echinoderms and do not have an air bladder.
- **Chondrichthyes**: This class includes sharks and rays, which are cartilaginous fishes and do not possess an air bladder.
- **Actinopterygii**: This class includes bony fishes, which typically have an air bladder.
- **Flying Fishes**: These are a type of bony fish that have an air bladder.

3. **Identifying the Correct Option**: Among the options, flying fishes belong to the class Actinopterygii, which is known for having an air bladder. The air bladder is a sac-like outgrowth from the dorsal wall of the esophagus and serves functions such as buoyancy and, in some cases, respiration.

4. **Conclusion**: Based on the analysis, the correct answer is **flying fishes**, as they are bony fishes that possess an air bladder.

**Final Answer**: Flying Fishes

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