anthropogenic ecosystem is characterized by all of the followings, except

Options

A. little cycling of nutrients
B. have little diversity
C. low productivity
D. simple food chain

Answer

To solve the question regarding the characteristics of an anthropogenic ecosystem, we will analyze each option provided and determine which one does not fit the typical traits of such ecosystems.

### Step-by-Step Solution:

1. **Understand Anthropogenic Ecosystems**:
- Anthropogenic ecosystems are those that are heavily influenced or created by human activities. They often include urban areas, agricultural lands, and other modified environments.

2. **Analyze the Options**:
- **Option A: Little cycling of nutrients**: This suggests that there is minimal movement or recycling of nutrients within the ecosystem. However, anthropogenic ecosystems often have a high degree of nutrient cycling due to human interventions (like fertilization in agriculture). Therefore, this statement is likely incorrect.
- **Option B: Have little diversity**: Anthropogenic ecosystems typically have reduced biodiversity compared to natural ecosystems due to habitat destruction and pollution. This statement is correct.
- **Option C: Low productivity**: While some anthropogenic ecosystems can have low productivity, many agricultural systems are highly productive due to human management. However, in general, natural ecosystems tend to be more productive than anthropogenic ones. This statement is also correct in a broader context.
- **Option D: Simple food chain**: Anthropogenic ecosystems often have simpler food chains compared to more complex natural ecosystems due to the dominance of a few species that thrive in human-altered environments. This statement is correct.

3. **Identify the Exception**:
- After analyzing all the options, it is clear that **Option A (Little cycling of nutrients)** is the exception, as anthropogenic ecosystems often have a high degree of nutrient cycling due to human activities.

4. **Conclusion**:
- The correct answer to the question is **Option A: Little cycling of nutrients**.

### Final Answer:
The anthropogenic ecosystem is characterized by all of the following, except **little cycling of nutrients**.

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