Final answer:
The significance of using 37 degrees Celsius to test salivary amylase activity is that it is the optimal temperature for amylase activity.
Step-by-step explanation:
The significance of using a temperature of 37 degrees Celsius to test salivary amylase activity is that it is the optimal temperature for amylase activity. Most enzymes, including amylase, have their maximum activity between 37°C and 40°C. At higher temperatures, enzymes become less active and may denature, while at lower temperatures, their activity decreases.