Which of the following is an example of an abiotic agent that can cause plant injury?

Abiotic agents are non-living factors that can cause stress or injury to plants. Temperature is a prime example of an abiotic factor; it can lead to various forms of plant injury, such as frost damage during cold weather or scorching during excessive heat. Plants have specific temperature ranges in which they thrive, and deviations from those ranges can result in physiological stress, decreased growth, or even death.

The other options—fungi, bacteria, and viruses—are all classified as biotic agents, as they are living organisms that can cause disease or injury to plants through direct infection, competition, or other interactions. Understanding the distinction between biotic and abiotic factors is crucial for effective plant management and protection strategies.