Ascaris and Cockroach resemble each other in

Options

A. Pseudocoel
B. Sexual dimorphism
C. Nephridia
D. Dorsal tubular nerve cord.

Answer

To solve the question "Ascaris and Cockroach resemble each other in?", we need to analyze the options provided and understand the characteristics of both organisms.

### Step-by-Step Solution:

1. **Identify the Organisms**:
- Ascaris is a roundworm belonging to the phylum Nematoda (not Ascalmynthus, which seems to be a typographical error in the transcript).
- Cockroach belongs to the phylum Arthropoda.

2. **Analyze the Options**:
- **Option 1: Pseudocoelom**:
- Ascaris is a pseudocoelomate, while cockroaches are eucoelomate. Therefore, they do not resemble each other in this aspect.
- **Option 2: Sexual Dimorphism**:
- Sexual dimorphism refers to the differences in size or appearance between males and females of the same species.
- In Ascaris, males are smaller and have a coiled tail, while females are larger.
- In cockroaches, males have distinct structures (anal cerci) that females lack. Thus, both organisms exhibit sexual dimorphism.
- **Option 3: Nephridia**:
- Nephridia are excretory structures found in annelids. Ascaris does not have nephridia, nor does the cockroach, making this option incorrect.
- **Option 4: Dorsal Tubular Nerve Cord**:
- This feature is characteristic of chordates, not of Ascaris or cockroaches. Hence, this option is also incorrect.

3. **Conclusion**:
- The only option that correctly identifies a similarity between Ascaris and cockroach is **sexual dimorphism**.

### Final Answer:
Ascaris and Cockroach resemble each other in **sexual dimorphism**.

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