One of the following is pseudocoelomate

Options

A. Leech
B. Liver fluke
C. Hookworm
D. Jelly fish

Answer

To determine which of the following organisms is pseudocoelomate, we will analyze each option provided:

1. **Leech**:
- Leeches belong to the phylum Annelida.
- Annelids have a true coelom, which is a fluid-filled body cavity completely lined by mesodermal tissue.
- Therefore, leeches are not pseudocoelomate.

2. **Liver Fluke**:
- Liver flukes belong to the phylum Platyhelminthes (flatworms).
- Flatworms are acoelomate, meaning they lack a body cavity entirely.
- Hence, liver flukes are also not pseudocoelomate.

3. **Hookworm**:
- Hookworms, such as Ancylostoma, belong to the phylum Nematoda (roundworms).
- Nematodes are classified as pseudocoelomates because they possess a pseudocoelom, which is a body cavity that is not completely lined by mesodermal tissue. Instead, it is located between the mesoderm and the ectoderm.
- Therefore, hookworms are indeed pseudocoelomate.

4. **Jellyfish**:
- Jellyfish belong to the phylum Cnidaria.
- Cnidarians are also acoelomate, meaning they do not have a true coelom.
- Thus, jellyfish are not pseudocoelomate.

**Conclusion**: The only organism from the options that is pseudocoelomate is the **hookworm**.