Which parasite will not exist if all freshwater bodies dry up once for all ?

Options

A. Taenia
B. Entamoeba
C. Fasciola
D. Ascaris

Answer

To determine which parasite will not exist if all freshwater bodies dry up, we can analyze the habitats and life cycles of the given parasites: Tenia, Entamoeba, Fasciola, and Ascaris.

### Step-by-Step Solution:

1. **Identify the Parasites**: The parasites in question are Tenia, Entamoeba, Fasciola, and Ascaris.

2. **Analyze Tenia**:
- Tenia (tapeworm) is a terrestrial parasite.
- It primarily lives in the intestines of hosts like cattle and pigs.
- Its life cycle involves eggs being deposited in soil, which does not depend on freshwater bodies.
- **Conclusion**: Tenia would still exist if freshwater bodies dried up.

3. **Analyze Entamoeba**:
- Entamoeba is a protozoan parasite that can be found in contaminated food and water.
- It does not require freshwater bodies for its life cycle, as it can also spread through contaminated food.
- **Conclusion**: Entamoeba would still exist even if freshwater bodies dried up.

4. **Analyze Fasciola**:
- Fasciola (liver fluke) is a parasitic flatworm that requires freshwater bodies for its life cycle.
- It relies on a snail as an intermediate host, which lives in freshwater, and its larvae are found in aquatic plants.
- If all freshwater bodies dry up, Fasciola would not have a habitat or hosts to survive.
- **Conclusion**: Fasciola would not exist if all freshwater bodies dried up.

5. **Analyze Ascaris**:
- Ascaris is a terrestrial roundworm that spreads through contaminated soil and food.
- It does not depend on freshwater bodies for its life cycle.
- **Conclusion**: Ascaris would still exist if freshwater bodies dried up.

6. **Final Answer**:
- The parasite that will not exist if all freshwater bodies dry up is **Fasciola**.