Which of the following statements is wrong?

Options

A. 1. A stable community should show much variation in productivity from year to year
B. 2. According to Tillman's long term ecosystem experiments increased diversity contributed to higher productivity
C. 3. Stable community must be resistant to occasional disturbances
D. 4. Rich biodiversity is essential for ecosystem health but imperative for the very survival of the human race on this planet

Answer

To determine which statement is wrong, we will analyze each of the four statements provided in the question.

### Step-by-Step Solution:

1. **Analyze Statement 1**: "A stable community should show much variation in productivity from year to year."
- A stable community is characterized by minimal variation in productivity. High variability can indicate instability. Therefore, this statement is incorrect.

2. **Analyze Statement 2**: "According to Tilman's long-term ecosystem experiments, increased diversity contributed to higher productivity."
- Research by Tilman has shown that greater biodiversity often leads to higher productivity in ecosystems. This statement is correct.

3. **Analyze Statement 3**: "Stable community must be resistant to occasional disturbances."
- A stable community should indeed be able to withstand occasional disturbances without significant changes in its structure or function. This statement is correct.

4. **Analyze Statement 4**: "Rich biodiversity is essential for ecosystem health but imperative for the very survival of the human race on this planet."
- Biodiversity is crucial for maintaining ecosystem health and services that support human life. This statement is correct.

### Conclusion:
The only incorrect statement is **Statement 1**: "A stable community should show much variation in productivity from year to year."

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