Select the correct statement among the following .
I. Euryhaline can tolerate a wide rang of salinity
II. The productivity and distribution of plants are heavily dependent on water
III. Many freshwater animals cannot live for long in seawater but sea animals can live in freshwater for a long time because of osmotic balance

Options

A. All are correct
B. All are false
C. Only III is incorrect
D. I and II are incorrect

Answer

To solve the question, we need to analyze each statement one by one to determine their correctness.

### Step 1: Analyze Statement I
**Statement I:** Euryhaline can tolerate a wide range of salinity.
- **Explanation:** Euryhaline organisms are indeed capable of surviving in environments with varying salinity levels. This adaptability allows them to thrive in both freshwater and saltwater. An example of a euryhaline organism is the green crab.
- **Conclusion:** This statement is **correct**.

### Step 2: Analyze Statement II
**Statement II:** The productivity and distribution of plants are heavily dependent on water.
- **Explanation:** Water is a crucial resource for plant growth, affecting photosynthesis, nutrient uptake, and overall health. The availability of water directly influences where plants can grow and their productivity levels.
- **Conclusion:** This statement is **correct**.

### Step 3: Analyze Statement III
**Statement III:** Many freshwater animals cannot live for long in seawater, but sea animals can live in freshwater for a long time because of osmotic balance.
- **Explanation:** Freshwater animals are adapted to low salinity environments and face osmotic stress when placed in seawater, leading to dehydration. Conversely, marine animals are adapted to higher salinity and can struggle in freshwater environments due to osmotic influx, which can be harmful. Therefore, the assertion that sea animals can live in freshwater for a long time is misleading.
- **Conclusion:** This statement is **incorrect**.

### Final Conclusion:
After analyzing all three statements:
- Statement I: Correct
- Statement II: Correct
- Statement III: Incorrect

Thus, the correct answer is that **only Statement III is incorrect**.