`"Ascaris"//"Nemathelminthes"` possesses body cavity called

Options

A. Coelom
B. Psedocoelom
C. Haemocoel
D. Coelenteron

Answer

To answer the question regarding the body cavity possessed by "Ascaris" from the phylum Nemathelminthes, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**: The organism in question is "Ascaris," which is a type of roundworm belonging to the phylum Nemathelminthes (or Nematoda).

2. **Understand Body Cavities**: In biology, organisms can have different types of body cavities, which are classified as:
- **Coelom**: A true body cavity lined with mesoderm.
- **Pseudocoelom**: A body cavity that is not completely lined with mesoderm; it is located between the mesoderm and endoderm.
- **Acoelomate**: Organisms that do not have a body cavity.

3. **Analyze the Options**:
- **Column**: This term is not used to describe any known body cavity in organisms.
- **Pseudocoelom**: This is the correct term for the body cavity found in nematodes like Ascaris. It is a fluid-filled space that is not completely lined by mesoderm.
- **Hemocoel**: This term refers to a body cavity found in some invertebrates, but it is not applicable to Ascaris.
- **Coelenteron**: This term refers to the central cavity in cnidarians and is not relevant to nematodes.

4. **Conclusion**: Based on the analysis, the body cavity possessed by Ascaris is called a **pseudocoelom**.

### Final Answer:
Ascaris possesses a body cavity called a **pseudocoelom**.

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