Digestion Lab:

Question: Does saliva convert starchy foods into sugars that our body can use to convert into energy?

Hypothesis: (Make sure this is an If…Than statement. Your hypothesis should be related to the experiment.)

Variables: (List all parts that serve as variables in this experiment.)

1.) Control:

2.) Independent:

3.) Dependent:

Materials: 8 sandwich Ziploc bags, 4 unsalted soda crackers, Iodine Solution in labeled jar, Benedict’s Solution in labeled jar, 2 labeled eye-droppers (I) & (B), hot pot and microwave, measuring cup filled with water, measuring spoon (1 tsp.), magnifiers, sharpie marker

Procedures for Day 1:

1.) Choose two volunteers from your group to go outside with a Ziploc bag each. These people will volunteer to donate saliva. Make sure to provide lots of saliva in the bottom of your bag.

2.) Students at lab table will label two bags as follows:

1 tsp. water only (No saliva)

1 tsp. water + Cracker Crumbs

When your volunteers return with saliva, label those two bags as follows:

1 tsp. water + saliva

1 tsp. water + saliva + Cracker Crumbs

3.) Crush two soda crackers into tiny crumbs and drop them into your two labeled bags.

4.) Put 1 tsp. of water into each of the four bags.

5.) Create a data chart. (You will fill in the chart I provide below. Make sure you recreate this chart for your analysis section of the lab report.)

6.) Add 2 drops of Iodine Solution to the 4 Ziploc bags. Observe by using the magnifiers and record your observations on your chart.

Procedures for Day 2:

1.) Choose two volunteers from your group to go outside with a Ziploc bag each. These people will volunteer to donate saliva. Make sure to provide lots of saliva in the bottom of your bag.

2.) Students at lab table will label two bags as follows:

1 tsp. water only (No saliva)

1 tsp. water + Cracker Crumbs

When your volunteers return with saliva, label those two bags as follows:

1 tsp. water + saliva

1 tsp. water + saliva + Cracker Crumbs

3.) Crush two soda crackers into tiny crumbs and drop them into your two labeled bags.

4.) Put 1 tsp. of water into each of the four bags.

5.) Create a data chart. (You will fill in the chart I provide below. Make sure you recreate this chart for your analysis section of the lab report.)

6.) Add two squirts of Benedict’s Solution to the 4 Ziploc bags. Observe by using the magnifiers and record your observations on your chart.

Analysis: (Make sure you include your two charts in this section and discuss the data!!! Use the guidelines on the website!!!)

Conclusion: