A field exposed to excessive pesticide use shows a sharp decline in earthworm population. The resulting effect on soil is:
Reduced soil fertility
The question focuses on the impact of excessive pesticide use on the earthworm population and its subsequent effect on soil. Let's analyze the options and understand why "Reduced soil fertility" is the correct answer.
- Understanding the role of earthworms: Earthworms play a crucial role in maintaining soil health. They decompose organic matter, improve soil aeration, and help mix nutrients in the soil, contributing significantly to soil fertility.
- Effect of excessive pesticide use: Pesticides can be harmful to non-target organisms, including earthworms. High levels of pesticides can lead to a sharp decline in the earthworm population. This decline disrupts the natural soil processes and reduces the decomposition of organic matter, ultimately leading to a decrease in soil fertility.
- Analyzing the options:
- Reduced soil fertility: This is the direct consequence of a decline in earthworm population since they contribute to nutrient cycling and soil structure, essential aspects of soil fertility.
- Increased water retention: Earthworms help in creating pores in the soil, which aids in drainage rather than retention. Their absence might not necessarily increase water retention, and this option does not directly relate to the effect of their population decline.
- Enhanced decomposition: With fewer earthworms, there is actually a decrease in decomposition rates since earthworms are key agents of decomposition.
- Improved aeration: Without earthworms, soil aeration diminishes because they create channels in the soil. Thus, their decline would not improve aeration.
- Conclusion: Based on these insights, the correct answer is Reduced soil fertility as earthworms play an essential role in maintaining and enhancing soil structure and nutrient content. Their decline directly impacts soil fertility negatively.
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