Common feature in earthworm and cockroach is

Options

A. Cuticle (exoskeleton)
B. Solid and ventral nerve cord
C. Nephirdia
D. Malpighian tubules

Answer

**Step-by-Step Text Solution:**

1. **Identify the Organisms**: The question asks for a common feature between the earthworm and the cockroach. Both of these organisms are invertebrates, meaning they lack a backbone.

2. **Analyze the Options**: The options provided are:
- A) Cuticle (exoskeleton)
- B) Solid and ventral nerve cord
- C) Nephridia
- D) Malpighian tubules

3. **Evaluate Each Option**:
- **Option A (Cuticle)**: The earthworm has a moist cuticle, but it does not have an exoskeleton like the cockroach. Therefore, this option is incorrect.
- **Option B (Solid and ventral nerve cord)**: Both the earthworm and the cockroach possess a solid ventral nerve cord, which is a characteristic feature of many invertebrates. This option is correct.
- **Option C (Nephridia)**: Nephridia are excretory structures found in earthworms but are not present in cockroaches. Thus, this option is incorrect.
- **Option D (Malpighian tubules)**: These are excretory structures found in cockroaches but not in earthworms. Therefore, this option is also incorrect.

4. **Conclusion**: After evaluating all the options, the common feature between the earthworm and the cockroach is the presence of a solid and ventral nerve cord.

5. **Final Answer**: The correct answer is **Option B: Solid and ventral nerve cord**.

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