What distinguishes immediate effects from delayed effects?

Immediate effects are characterized by symptoms that occur shortly after exposure to a pesticide or chemical. This means that individuals may start to experience reactions, such as nausea, vomiting, or skin irritation, almost instantly or within a very short time frame following contact with the substance. This immediate onset of symptoms is crucial for understanding how a pesticide can affect human health right after exposure and emphasizes the importance of safety measures during application.

In contrast, delayed effects can take hours, days, or even longer to manifest after the initial exposure. These might involve chronic health issues or delayed reactions that are not immediately apparent, which can sometimes lead to difficulties in linking the symptoms back to the initial exposure.

Factors to consider regarding the other options include that while immediate effects can often seem more severe, this isn't a defining characteristic, as severity can vary widely. Additionally, it's untrue to suggest that delayed effects have no symptoms, as they can often lead to serious long-term health problems. Lastly, the assertion that delayed effects do not exist is inaccurate, as many substances can indeed cause delayed health impacts after the exposure has occurred.