Question

which solution is the positive control?
distilled water
starch solution
glucose solution

Explanation:

In an experiment, a positive - control is a sample known to produce a positive result. Glucose is a simple sugar that can give a positive result in many biochemical tests related to sugar detection. Distilled water is a negative - control as it contains no test - relevant substances. Starch is a complex carbohydrate and not typically a positive - control for simple sugar - related tests.

Answer:

C. Glucose solution