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Excretory organ in annelida origin...

Excretory organ in annelida origin

A

Ectoderm

B

Mesoderm

C

Endodem

D

All the above

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Annelida**: Annelida refers to a phylum of segmented worms. These organisms exhibit metameric segmentation, meaning their bodies are divided into repeated segments. 2. **Excretory Structures**: The primary excretory structures in Annelida are called nephridia. Nephridia are ciliated, tube-like structures that facilitate the removal of waste from the body. 3. **Origin of Nephridia**: The question asks about the origin of these excretory organs. In Annelida, nephridia originate from the ectoderm, which is the outermost layer of cells in the embryo. 4. **Ectoderm vs. Other Layers**: - The ectoderm is responsible for forming structures on the outer surface of the body, including the excretory organs. - The mesoderm, which lies between the ectoderm and endoderm, primarily gives rise to muscles and blood vessels, not excretory organs. - The endoderm is the innermost layer that forms internal organs, such as the digestive system, but not the excretory system. 5. **Conclusion**: Therefore, the excretory organs in Annelida originate from the ectoderm. This is the correct answer to the question.
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