A common character between septal nephridia of earthworm and Malpighain tubules of cockroach is that both

Options

A. have ciliated funnels
B. discharge into alimentary canal
C. are segmental strucutres
D. discharge directly outside body

Answer

**Step-by-Step Solution:**

1. **Understanding Septal Nephridia:**
- Septal nephridia are excretory structures found in earthworms. They are located between the 15th segment and the last segment of the earthworm.
- These structures are ciliated coiled tubules that play a role in regulating body fluids.

2. **Function of Septal Nephridia:**
- Septal nephridia discharge their contents into the intestine, which is part of the alimentary canal. This is important for the excretion of waste materials.

3. **Understanding Malpighian Tubules:**
- Malpighian tubules are excretory structures found in cockroaches. They are thin, filamentous structures located between the midgut and hindgut.
- These tubules also play a role in excretion and osmoregulation.

4. **Function of Malpighian Tubules:**
- Similar to septal nephridia, Malpighian tubules discharge their contents into the alimentary canal, specifically into the hindgut.

5. **Comparing Both Structures:**
- Both septal nephridia and Malpighian tubules share a common characteristic: they both discharge their excretory products into the alimentary canal.
- This means they both play a role in the excretory process by connecting to the digestive system.

6. **Evaluating the Options:**
- Option 1: "Have ciliated funnels" - Incorrect, as ciliated funnels are only present in septal nephridia.
- Option 2: "Discharge into alimentary canal" - Correct, as both structures discharge into the alimentary canal.
- Option 3: "Are segmented structures" - Incorrect, as Malpighian tubules are not segmented.
- Option 4: "Discharge directly outside the body" - Incorrect, as they both discharge into the alimentary canal instead.

7. **Conclusion:**
- The common character between septal nephridia of earthworm and Malpighian tubules of cockroach is that both discharge into the alimentary canal.

**Final Answer:**
Both septal nephridia of earthworm and Malpighian tubules of cockroach discharge into the alimentary canal.

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