Which of the following best defines the term "pesticide"?

The term "pesticide" is best defined as a substance used to prevent, destroy, or repel pests. This definition encompasses a broad range of substances designed to target various types of pests, including insects, weeds, fungi, and other organisms that are considered harmful to crops, livestock, or public health. Pesticides play a critical role in pest management, ensuring the protection of agricultural products and contributing to food security.

The broad definition aligns with the purpose of pesticides, which is not limited to agricultural settings but can also extend to residential, industrial, and commercial use. By effectively managing pest populations, pesticides help reduce damage to plants and animals, promoting healthier ecosystems.

In contrast, substances that promote plant growth or enhance soil nutrients do not fall under the category of pesticides, as they do not specifically target pest control. Additionally, while some pesticides are used in agricultural settings, the term is not exclusive to agriculture; many pesticides are utilized in various environments, including homes and gardens, making the focus on agricultural purposes too narrow.