Mark the wrong statement

Options

A. Xanthine oxidase is required for the production of uric acid
B. Renette cells are excretory structures in Aschelminthes
C. Elasmobranchs are ammonotelic
D. In amniotes ureters arise as an outgrowth from Wolffian duct which changes into vas deferens

Answer

To solve the question "Mark the wrong statement," we need to analyze each statement provided in the options and determine which one is incorrect.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- **Statement**: "Xanthine oxidase is required for the production of uric acid."
- **Analysis**: This statement is correct. Xanthine oxidase is an enzyme that catalyzes the oxidation of xanthine to uric acid. Therefore, this statement is not the wrong one.

2. **Analyze the Second Statement**:
- **Statement**: "Renate cells are the excretory structure in Ascaris."
- **Analysis**: This statement is also correct. Renate cells are indeed involved in the excretory system of Ascaris, which is a type of nematode (roundworm). Thus, this statement is not the wrong one.

3. **Analyze the Third Statement**:
- **Statement**: "Elasmobranchs are ammonotelic."
- **Analysis**: This statement is correct. Elasmobranchs (like sharks and rays) excrete ammonia as their primary nitrogenous waste, which categorizes them as ammonotelic. Therefore, this statement is not the wrong one.

4. **Analyze the Fourth Statement**:
- **Statement**: "In amniotes, ureters arise as an outgrowth from the Wolffian duct, which changes into vas deferens."
- **Analysis**: This statement is incorrect. In amniotes, the ureters do arise from the Wolffian duct (mesonephric duct), but the Wolffian duct itself does not change into the vas deferens. Instead, the Wolffian duct persists in males as the vas deferens, while the ureters develop separately. Therefore, this statement is the wrong one.

### Conclusion:
The wrong statement is option 4: "In amniotes, ureters arise as an outgrowth from the Wolffian duct, which changes into vas deferens."

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