What is the main risk associated with organophosphate pesticides if not used properly?

• A. They are ineffective against pests
• B. They can harm beneficial insects only
• C. They can be toxic to humans and the environment
• D. They are too expensive to use

Answer: (C)

Organophosphate pesticides pose a significant risk of toxicity to humans and the environment when they are not used properly. These chemicals work by disrupting the normal functioning of the nervous system in pests, but the same mechanism can also affect non-target organisms, including humans, pets, and wildlife. If misapplied or overused, organophosphates can enter the air, water, and soil, leading to widespread contamination and unintended exposure. Symptoms of poisoning can manifest in humans as headaches, dizziness, nausea, and in severe cases, can lead to critical health issues or death.

The other options do not accurately encompass the main risks. For instance, stating that they are ineffective against pests overlooks their potent efficacy when applied correctly. Suggesting that they only harm beneficial insects does not recognize the broader scope of potential toxicity. Lastly, while cost may factor into some users' decisions, the primary concern surrounding organophosphate pesticides relates to their potential harmful effects rather than their price. Thus, the emphasis on their toxicity highlights the importance of cautious handling and adherence to safety measures when using these substances in pest control.