Final answer:
Using a 37°C incubation temperature is significant for testing salivary amylase activity because it is the enzyme's optimum temperature for functioning effectively.
Step-by-step explanation:
Temperature is an important factor in determining the activity of enzymes, including salivary amylase. Enzymes have an ideal temperature at which they function most effectively, known as the optimum temperature. For salivary amylase, its optimum temperature is around 37°C, which is the normal body temperature. At this temperature, salivary amylase breaks down starch in saliva into sugar, initiating the digestion process in the mouth.