The greatest temperature that most plants can withstand before their proteins denature is approximate:
40-50°C
50-60°C
60-70°C
70-80°C
Most plants can withstand a maximum temperature of 50-60°C (122-140°F) before their proteins denature.
The temperature at which the plant's proteins begin to break down and lose their function is referred to as the thermal death point for plants. Plant cells begin to break down at temperatures over this range, and the plant eventually dies.
However, different plants have varying temperature tolerances, and some plants may be able to survive higher temperatures than others.
Other environmental elements, such as humidity and light, can also influence a plant's ability to withstand high temperatures.
Overall, proper growing conditions for plants must be monitored and maintained to ensure their health and output.
Option 2 is the correct answer.