Anus is absent in

Options

A. Fasciola
B. Pheritima
C. Periplaneta
D. Unio

Answer

To solve the question "Anus is absent in," we will analyze the options provided and identify which organism belongs to a group known for having an incomplete digestive system.

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking which organism does not have an anus. This typically indicates that the organism has an incomplete digestive system.

2. **Identify the Groups**: The options provided are:
- A) Fascicula
- B) Ferritima
- C) Periplaneta
- D) Unio

3. **Classify the Organisms**:
- **Fascicula**: This organism belongs to the phylum Platyhelminthes (flatworms), which are known to have an incomplete digestive system with only one opening (mouth).
- **Ferritima**: This organism belongs to the phylum Annelida (segmented worms) and has a complete digestive system, including an anus.
- **Periplaneta**: This is a genus of cockroaches, belonging to the phylum Arthropoda, which also have a complete digestive system.
- **Unio**: This is a genus of freshwater mussels, belonging to the phylum Mollusca, which typically have a complete digestive system.

4. **Determine the Correct Answer**: Since Fascicula is the only organism listed that belongs to the phylum Platyhelminthes, and this phylum is characterized by having an incomplete digestive system (thus, no anus), the correct answer is:
- **A) Fascicula**

### Final Answer:
The anus is absent in **Fascicula**.