A free living roundworm is

Options

A. Enterobius
B. Rhabditis
C. Dracunculus
D. Trichinella

Answer

To determine which organism is a free-living roundworm, we will analyze the options provided based on their characteristics and habitats.

### Step-by-Step Solution:

1. **Understanding Roundworms**: Roundworms belong to the phylum Nematoda. They can be either free-living or parasitic. Most roundworms are endoparasites, meaning they live inside a host organism.

2. **Analyzing the Options**:
- **Option 1: Enterobius (Pinworm)**: This organism is known to be a parasite that resides in the large intestine of its host. Since it lives inside a host, it is not a free-living roundworm.

- **Option 2: Rhabditis (Rhabditiform Larva)**: This larva is known to be free-living. It is associated with the nematode Ascaris, which is a parasitic roundworm. However, the larval stage can exist freely in the environment, making this a potential candidate for a free-living roundworm.

- **Option 3: Dracunculus (Guinea Worm)**: This is another parasitic roundworm that lives in the tissues of its host. It is not free-living, so this option is incorrect.

- **Option 4: Trichinella**: This organism is known to cause trichinosis and is found in the muscles of its host. It is also a parasite and not free-living.

3. **Conclusion**: After analyzing all the options, the only organism that qualifies as a free-living roundworm is **Rhabditis**. Therefore, the correct answer is **Option 2**.