The first and last moults of Ascaris occur in or Fourth moulting of Ascaris occur in

Options

A. Heart
B. Kidney
C. Liver
D. Interstine

Answer

To answer the question regarding the first and last moults of Ascaris and where the fourth moulting occurs, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Molting**:
- Molting refers to the process where an organism sheds its outer layer (cuticle) to grow. In Ascaris, which is a type of roundworm, there are four distinct molting stages during its development from juvenile to adult.

2. **Identify the Stages of Molting in Ascaris**:
- Ascaris undergoes four molting stages:
- **First Stage**: Occurs in the soil.
- **Second Stage**: Occurs in the intestine.
- **Third Stage**: Occurs in the lungs.
- **Fourth Stage**: Occurs in the small intestine.

3. **Determine the Locations for the First and Last Moults**:
- The **first molt** occurs in the soil, and the **last (fourth) molt** occurs in the small intestine.

4. **Answer the Question**:
- According to the information provided, the first and last moults of Ascaris occur in the soil and small intestine, respectively. The fourth molting specifically occurs in the small intestine.

5. **Select the Correct Option**:
- Among the options provided (heart, kidney, liver, and intestine), the correct answer for the fourth molting of Ascaris is the **intestine**.

### Final Answer:
The first and last moults of Ascaris occur in the soil and small intestine, respectively, and the fourth molting occurs in the **intestine**.

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