Which one of the following pairs of animals comprises "Jawless fishes"

Options

A. Lampreys and hag fishes
B. Guppies and hag fishes
C. Lampreys and eels
D. Mackerals and Rohu

Answer

To solve the question "Which one of the following pairs of animals comprises 'Jawless fishes'?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Jawless Fishes**:
- Jawless fishes are those that do not possess jaws. They belong to the group called Agnatha.

2. **Identify the Class of Jawless Fishes**:
- The main class of jawless fishes is Cyclostomata, which is characterized by having a circular mouth.

3. **Examine the Options Given**:
- **Option 1**: Lampreys and Hagfishes
- **Option 2**: Guppies and Hagfishes
- **Option 3**: Lampreys and Eels
- **Option 4**: Mackerels and Rohu

4. **Analyze Each Option**:
- **Option 1**: Lampreys and Hagfishes are both jawless fishes and belong to the class Cyclostomata.
- **Option 2**: Guppies are bony fishes (they have jaws), so this option is incorrect.
- **Option 3**: Eels are also bony fishes (they have jaws), so this option is incorrect.
- **Option 4**: Mackerels and Rohu are both bony fishes, so this option is incorrect.

5. **Determine the Correct Answer**:
- The only pair that consists of jawless fishes is **Option 1: Lampreys and Hagfishes**.

### Final Answer:
The correct answer is **Lampreys and Hagfishes**.

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