Which animal do not possess larval stage in its life cycle

Options

A. Ascaris
B. Frog
C. Taenia
D. Pheretima

Answer

To determine which animal does not possess a larval stage in its life cycle, we will analyze each of the options provided:

1. **Ascaris**:
- Ascaris is a genus of parasitic worms, commonly known as roundworms.
- They have multiple larval stages in their life cycle, including the Raptidiform Larva.
- Therefore, Ascaris does possess a larval stage.

2. **Frog**:
- Frogs undergo a metamorphic life cycle that includes a larval stage known as a tadpole.
- Tadpoles are aquatic and have gills, a tail, and no legs, which later develop into adult frog characteristics.
- Hence, frogs also possess a larval stage.

3. **Tenia (Tapeworm)**:
- Tenia, specifically Tenia solium (pork tapeworm), has several larval stages in its life cycle.
- One of the larval forms is called cysticerus, which can cause the disease cysticercosis.
- Therefore, Tenia also possesses a larval stage.

4. **Faridima**:
- Faridima is a genus of flatworms that do not have a larval stage in their life cycle.
- They develop directly into adults without going through a larval form.
- Thus, Faridima is the correct answer as it does not possess a larval stage.

**Final Answer**: The animal that does not possess a larval stage in its life cycle is **Faridima**.

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