Which term relates to the harmful effects on plants caused by certain chemicals?

The term that relates to the harmful effects on plants caused by certain chemicals is phytotoxicity. This concept specifically refers to the degree to which a chemical substance can be toxic to plant life. When plants are exposed to certain herbicides, pesticides, or environmental contaminants, they may experience negative effects such as stunted growth, tissue damage, or even death. Understanding phytotoxicity is essential for applicators to mitigate risks to non-target plants when using agricultural chemicals.

Phytoremediation, on the other hand, involves using plants to absorb, detoxify, or stabilize pollutants in the environment, rather than focusing on the harmful effects. Phytochemistry is the study of chemicals derived from plants, not their toxicological impacts. Phytopathology is the study of plant diseases, which encompasses a broader range of issues, including pathogens, but it does not specifically address chemical toxicity. Therefore, the correct choice directly addresses the phenomenon of chemical-induced harm to plant life.