Which of the following characteristics does not belong to Labeo ( Rohu ) ?

Options

A. Streamline body
B. operculate gills
C. air bladder absent
D. terminal mouth

Answer

To solve the question, "Which of the following characteristics does not belong to Labeo (Rohu)?", we will analyze the characteristics of Labeo (Rohu) and identify the one that does not apply.

### Step-by-Step Solution:

1. **Identify the Characteristics of Labeo (Rohu)**:
- Labeo (Rohu) is a bony fish found in freshwater.
- It belongs to the class Osteichthyes, which are characterized by having a bony skeleton.

2. **List the Key Features**:
- **Air Bladder**: Present in Labeo (Rohu), which helps in buoyancy and floating.
- **Mouth Type**: Terminal mouth, meaning the mouth is located at the front end of the fish.
- **Gills**: Operculate gills, which are covered by an operculum and facilitate respiration.
- **Body Shape**: Streamlined body, which aids in swimming and reduces water resistance.

3. **Evaluate the Options**:
- **Streamlined Body**: This is a characteristic of Labeo (Rohu).
- **Operculate Gills**: This is also a characteristic of Labeo (Rohu).
- **Air Bladder Absent**: This is incorrect because Labeo (Rohu) has an air bladder.
- **Terminal Mouth**: This is a characteristic of Labeo (Rohu).

4. **Conclusion**:
- The characteristic that does not belong to Labeo (Rohu) is "Air Bladder Absent". This is the only option that is incorrect, as Labeo (Rohu) does have an air bladder.

### Final Answer:
The characteristic that does not belong to Labeo (Rohu) is "Air Bladder Absent".

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