To analyze the statements provided in the question, we will evaluate each statement one by one and determine their correctness based on biological principles related to organisms and their environments.
### Step-by-Step Solution:
1. **Statement I: Organisms living in oceans, lakes, and rivers face water-related problems.**
- **Analysis:** This statement is correct. Aquatic organisms do face water-related issues, such as changes in water quality, chemical composition, and pH levels, which can affect their survival. Therefore, this statement is true.
2. **Statement II: Euryhaline can tolerate a wide range of salinities.**
- **Analysis:** This statement is also correct. Euryhaline organisms, such as salmon, can survive in environments with varying salinity levels, making them adaptable to different aquatic conditions. Thus, this statement is true.
3. **Statement III: Stenohaline are restricted to a narrow range of salinities.**
- **Analysis:** This statement is correct as well. Stenohaline organisms, like sharks, can only thrive within a specific salinity range and cannot tolerate significant changes in salinity. Therefore, this statement is true.
4. **Statement IV: No fresh water animals can live for long in sea water, but sea animals can live in fresh water for a long time because of osmotic balance.**
- **Analysis:** This statement is incorrect. Freshwater animals cannot survive in seawater for long due to osmotic stress, as their bodies are adapted to low salinity. Similarly, marine animals cannot live in freshwater for extended periods because their bodies are adapted to high salinity, leading to osmotic imbalance. Therefore, this statement is false.
5. **Statement V: The salt concentration is less than 5% in inland water, 30-35% in sea, and greater than 100% in some hypersaline lagoons.**
- **Analysis:** This statement is correct. The salinity levels mentioned are accurate, with inland waters having low salinity, seawater having moderate salinity, and hypersaline lagoons having very high salinity. Thus, this statement is true.
### Conclusion:
- Statements I, II, III, and V are correct, while Statement IV is incorrect. Therefore, the correct answer is that only Statement IV is wrong.
### Final Answer:
- The correct option is that only Statement IV is wrong.
