Which of the following is correct match?

Options

A. Human and Frog -Nucleated RBC
B. Ascaris and Liver fluke-Internal Fertilisation
C. Earthworm and cockroach -sexual dimorphism
D. Nereis and Hydra - Segmented body

Answer

To solve the question of which of the following is the correct match, we will analyze each option provided.

### Step-by-Step Solution:

1. **Option 1: Human and Frog matched with Nucleated RBC**
- Humans have red blood cells (RBCs) that lack a nucleus, while frogs have nucleated RBCs.
- **Conclusion:** This option is incorrect.

2. **Option 2: Ascaris and Liver Fluke matched with Internal Fertilization**
- Both Ascaris (a roundworm) and liver flukes (a type of flatworm) undergo internal fertilization.
- **Conclusion:** This option is correct.

3. **Option 3: Earthworm and Cockroach matched with Sexual Dimorphism**
- Earthworms are hermaphrodites, meaning they possess both male and female reproductive organs, while cockroaches exhibit sexual dimorphism (distinct male and female forms).
- **Conclusion:** This option is incorrect.

4. **Option 4: Hydra and Segmented Body**
- Hydra is a member of the phylum Cnidaria and does not have a segmented body; it has a simple body structure.
- **Conclusion:** This option is incorrect.

### Final Answer:
The correct match is **Option 2: Ascaris and Liver Fluke matched with Internal Fertilization.**