Animal group with pseudocoelom is

Options

A. Echinoderms
B. Mollusces
C. Aschelminthes/Nematodes
D. Annelids

Answer

To determine the animal group with a pseudocoelom, we can follow these steps:

### Step 1: Understand the Types of Body Cavities
- There are three main types of body cavities in animals:
1. **Acoelomate**: Animals that lack a body cavity.
2. **Coelomate**: Animals that have a true body cavity (coelom).
3. **Pseudocoelomate**: Animals that have a false body cavity (pseudocoelom).

### Step 2: Identify the Options Given
- The options provided are:
1. Echinoderm
2. Mollusca
3. Aschelminthes (Nematodes)
4. Annelida

### Step 3: Analyze Each Option
- **Echinoderm**: These are coelomates, as they have a true coelom.
- **Mollusca**: These are also coelomates, possessing a true coelom.
- **Aschelminthes (Nematodes)**: This group is characterized by having a pseudocoelom, which is a body cavity that is not completely lined with mesoderm.
- **Annelida**: These are coelomates, having a true coelom.

### Step 4: Conclusion
- Based on the analysis, the animal group that has a pseudocoelom is **Aschelminthes (Nematodes)**.

### Final Answer
The animal group with a pseudocoelom is **Aschelminthes (Nematodes)**.

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