This lab sheet guides grades 5 to 7 homeschoolers through a controlled experiment comparing starch plus saliva against starch plus water. Your student labels two cups, adds warm starch solution, introduces either saliva or plain water, and then waits fifteen minutes before adding iodine drops to reveal whether starch is still present. A color guide printed right on the sheet decodes the results: blue-black means starch remains, yellow-brown means it has mostly broken down. The observations table captures readings at both the fifteen-minute and thirty-minute marks, and four Think and Answer questions push your student to explain why the test and control cups looked different.

This digestive enzyme action lab sheet works naturally inside a unit study on human body systems, digestion, or biochemistry, and it stands alone just as well as a single-day hands-on learning activity. An extension section suggests testing at different temperatures and with other enzymes like protease, giving your homeschooler a clear path toward a multi-day investigation if you want to go deeper. Completing the sheet demonstrates that your student can design a controlled experiment, use an indicator chemical correctly, and connect lab results to what happens inside the human digestive system.