What describes a "pesticide"?

A pesticide is defined as a substance specifically designed to control or kill pests, which can include insects, weeds, fungi, and other organisms that negatively impact health or agricultural productivity. This definition encompasses a wide variety of products, including herbicides, insecticides, and fungicides, each targeting a specific type of pest.

This understanding is important, as it highlights the primary role of pesticides in managing pest populations and protecting crops and human health. The correct choice emphasizes the functional purpose of pesticides in agricultural practices and pest management strategies, which are vital components of ensuring food security and safe living environments.

In contrast, the other options do not accurately capture the definition of a pesticide. For example, a natural insect repellent focuses solely on repelling insects rather than controlling or killing them, which is a key function of pesticides. Fertilizers are used to promote plant growth, not to manage pests, and cooking herbs do not have any relation to pest control at all. Understanding these distinctions is essential for effective pest management practices.