What could be a result of exposure to pesticides?

Exposure to pesticides can indeed lead to immediate physical reactions such as irritation. This may include symptoms like skin rashes, eye irritation, respiratory issues, or gastrointestinal discomfort, depending on the type of pesticide and the method of exposure. These immediate reactions can be a result of the chemical's toxicity and how it interacts with the human body or other non-target organisms at the time of exposure. Understanding these reactions emphasizes the importance of safety precautions when handling pesticides to minimize health risks.

The other options, while they touch on relevant concepts, do not describe direct results of pesticide exposure in the same way. Enhanced immunity to pests and improvement in soil fertility do not directly result from human exposure to pesticides. In fact, over time, development of resistance in target organisms can occur due to repeated exposure, which can be counterproductive for pest control efforts.