Fourth moulting of ascaris occurs in

Options

A. lung
B. liver
C. intestine
D. soil

Answer

To answer the question about where the fourth molting of Ascaris occurs, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Molting**: Molting refers to the process of shedding the outer layer or skin, which in the case of Ascaris, is a transformation from larval to adult stages.

2. **Identifying the Stages of Molting**: Ascaris undergoes a total of four molting stages during its life cycle. Each of these stages occurs in different locations within the host or environment.

3. **Locating the First Molting**: The first molting occurs in the soil. This is where the eggs hatch and the larvae begin their development.

4. **Locating the Second and Third Molting**: The second and third molting stages occur in the lungs. After the larvae are swallowed and enter the digestive system, they migrate to the lungs where they undergo these two molting stages.

5. **Identifying the Fourth Molting**: The fourth molting occurs in the intestine. After the larvae have developed through the previous stages, they finally reach the intestine where they complete their development into adult Ascaris.

6. **Conclusion**: Therefore, the fourth molting of Ascaris occurs in the intestine.

### Final Answer:
The fourth molting of Ascaris occurs in the intestine.

---