Which one of the following is a characteristic feature of cropland ecosystem?

Options

A. Least genetic diversity
B. Absence of weeds
C. Ecological succession
D. Absence of soil organisms

Answer

To determine the characteristic feature of a cropland ecosystem, let's analyze the options provided:

1. **Understanding Cropland Ecosystem**:
- A cropland ecosystem is a man-made ecosystem where major crops are cultivated in a specific area. This means that human intervention plays a significant role in its structure and function.

2. **Analyzing the Options**:
- **Option A: Least Genetic Diversity**: In a cropland ecosystem, typically only one type of crop is cultivated in a given area. This leads to a reduction in genetic diversity because the ecosystem is dominated by a single species or variety of crop.
- **Option B: Absence of Weeds**: This is incorrect because weeds often grow in cropland ecosystems alongside cultivated crops, competing for resources.
- **Option C: Ecological Succession**: This is also incorrect as ecological succession is a natural process that occurs over time in ecosystems, but cropland ecosystems are maintained by human intervention, which prevents natural succession.
- **Option D: Absence of Soil Organisms**: This is incorrect as well, since soil organisms such as bacteria, fungi, and insects are present in cropland ecosystems, contributing to soil health and nutrient cycling.

3. **Conclusion**:
- The correct answer is **Option A: Least Genetic Diversity**, as it accurately describes a characteristic feature of cropland ecosystems due to the cultivation of a single crop type.

### Step-by-Step Solution:
1. Identify what a cropland ecosystem is.
2. Analyze each option provided in the question.
3. Determine which option best describes a characteristic feature of the cropland ecosystem.
4. Conclude that the correct answer is Option A: Least Genetic Diversity.