Class of earthworm Is:-

Options

A. Polychaeta
B. Oligochaeta
C. Hirudinea
D. Archiannelida

Answer

To determine the class of earthworm, we can follow these steps:

1. **Understand the Taxonomy of Earthworms**: Earthworms belong to the phylum Annelida, which is characterized by segmented bodies.

2. **Identify the Relevant Classes**: Within the phylum Annelida, there are different classes, including:
- Polychaeta: This class primarily includes marine annelids.
- Oligochaeta: This class includes both aquatic and terrestrial worms, which are commonly known as earthworms.
- Hirudinea: This class mainly consists of leeches.
- Archiannelida: This is an order that includes primitive polychaete worms.

3. **Analyze Each Class**:
- **Polychaeta**: Not applicable to earthworms as they are primarily marine.
- **Oligochaeta**: This is the class that includes earthworms, making it the correct choice.
- **Hirudinea**: This class is not relevant to earthworms as it pertains to leeches.
- **Archiannelida**: This is not a class of earthworms but rather an order of primitive worms.

4. **Conclude the Class of Earthworm**: Based on the analysis, the class that includes earthworms is Oligochaeta.

Thus, the class of earthworm is **Oligochaeta**.