Integumentary nephridia of Earthworm occur in

Options

A. All segments except the first two
B. First two segments of the body
C. First fifteen segments
D. All the segments

Answer

### Step-by-Step Solution:

1. **Understanding Integumentary Nephridia**: Integumentary nephridia are excretory structures found in earthworms. Their primary function is to remove metabolic waste from the body.

2. **Location of Integumentary Nephridia**: These nephridia are physically attached to the body wall of the earthworm. They are not found in the first two segments of the earthworm's body.

3. **Structure of Integumentary Nephridia**: Integumentary nephridia are closed internally and do not have a nephrostome (an opening that typically leads to the excretory system).

4. **Function of Integumentary Nephridia**: They specifically remove metabolic waste from the blood of the earthworm.

5. **Size and Quantity**: Integumentary nephridia are the smallest in size among the types of nephridia present in earthworms. The number of these nephridia varies from 200 to 250 per segment, but they are absent in the first two segments.

6. **Conclusion**: Based on the information, integumentary nephridia occur in all segments of the earthworm except the first two. Therefore, the correct answer to the question is: "All segments except the first two."

### Final Answer:
**Integumentary nephridia of Earthworm occur in all segments except the first two.**

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