What is heat stress?

• A. Results from prolonged exposure to high temperatures and humidity, leading to weakness and potential illness
• B. A condition caused by exposure to cold temperatures
• C. Damage to plant equipment due to heat
• D. An unrelated term for electrical overload

Answer: (A)

Heat stress happens when the body's cooling system can’t keep up in hot, humid conditions. Sweating isn’t cooling efficiently, so the core body temperature can rise, leading to weakness, fatigue, dizziness, and the potential for heat-related illness if exposure continues. That’s why this option is the best match: it describes prolonged exposure to high temperatures and humidity with resulting weakness and possible illness. The other options describe cold exposure, equipment damage, or an unrelated electrical term, which aren’t heat stress. In a plant safety context, it’s a risk that calls for precautions like hydration, rest breaks, shaded or cooler areas, and gradual acclimatization.