Alimentary canal in Ascheminthes has

Options

A. single opening
B. muscular intestine
C. muscular pharynx
D. peritoneum

Answer

To answer the question about the alimentary canal in Aschelminthes, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Group**: Aschelminthes, also known as nematodes, are a group of animals that have a specific type of digestive system.

2. **Understand the Digestive System**: The digestive system of Aschelminthes is classified as a complete digestive system. This means it has two openings: a mouth and an anus.

3. **Components of the Alimentary Canal**: The alimentary canal in Aschelminthes includes:
- Mouth: The opening through which food enters.
- Pharynx: A muscular tube that helps in the swallowing of food.
- Anus: The opening through which waste is expelled.

4. **Evaluate the Options**: Now, let’s look at the options provided in the question:
- **Single Opening**: This is characteristic of organisms in Platyhelminthes (flatworms), not Aschelminthes.
- **Muscular Intestine**: This feature is typically found in higher animals, including humans, but is not a defining characteristic of Aschelminthes.
- **Muscular Pharynx**: This is indeed present in Aschelminthes and is a key feature of their digestive system.
- **Peritoneum**: This structure is found in Annelida (segmented worms), not Aschelminthes.

5. **Conclusion**: Based on the analysis of the options, the correct answer is that the alimentary canal in Aschelminthes has a muscular pharynx.

### Final Answer:
The alimentary canal in Aschelminthes has a muscular pharynx.

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