Final answer:
Less amylase added to test tubes results in a slower reaction rate, meaning less starch is broken down to sugar as amylase is an enzyme that catalyzes this process.
Step-by-step explanation:
The experiment described seems to focus on the enzymatic activity of amylase, likely in terms of its ability to break down starch into simpler sugars. When less amylase is added to test tubes, we can expect a slower reaction rate, meaning that less starch would be broken down within a given time frame compared to tubes with more amylase. The converse would hold true for test tubes with more amylase: a higher amount of enzyme typically leads to a faster reaction rate, more starch breakdown, and thus more sugar produced. This is because enzymes, like amylase, are catalysts that accelerate chemical reactions without being consumed in the process. The amount of enzyme present is directly proportional to the reaction rate, up to a saturation point.