What is a pesticide?

A pesticide is defined as a substance specifically designed for the purpose of controlling, repelling, or exterminating pests, which include insects, rodents, weeds, fungi, and other organisms that can cause harm to plants, animals, or human health. The term encompasses a variety of substances that serve different functions, such as insecticides for insects, herbicides for weeds, and fungicides for fungi.

The second option correctly identifies this primary use of pesticides, emphasizing their role in pest management and protection in agricultural and non-agricultural settings. Understanding this definition is crucial for those in the pest control industry, as it highlights the importance of using these substances responsibly and effectively.

The other options, such as organic fertilizers, chemicals used to grow plants, or food additives, do not capture the specific function of a pesticide. Fertilizers are aimed at enhancing plant growth rather than controlling pests, while food additives generally refer to substances added to food for preservation or flavor enhancement, not pest management.