First, ask questions.
Is the sweetness of steamed bread related to the chewing of teeth, the stirring of tongue and the secretion of saliva? If so, what are their respective functions? Will the sweetness of steamed bread change the starch?
Second, make assumptions.
The sweetness of steamed bread is related to teeth chewing, tongue stirring and saliva secretion. Grinding teeth, grinding food, mixing food with saliva with tongue, and digesting food with saliva; The sweetness of steamed bread is the change of starch.
Third, design the inquiry scheme.
(1) Take fresh steamed bread and cut it into three small pieces of the same size: A, B and C. Chop up Block A and Block B with a knife and mix them evenly (simulating teeth chewing and tongue stirring), while Block C is not used as a control.
(2) Rinse your mouth with cold boiled water, which contains a piece of sterilized cotton wool. After about a minute, take out the cotton wool with clean tweezers and squeeze the saliva in the cotton wool into the beaker.
(3) Take three clean test tubes, numbered 1, No.2 and No.3 respectively, put steamed bread A into the test tube 1, inject saliva, and fully stir. Put B steamed bread crumbs into No.2 test tube, inject clean water and stir thoroughly. Put the C steamed bread block into the No.3 test tube. Inject saliva without stirring. Then put the test tubes together in warm water of about 37 degrees.
(4) After five to ten minutes, take out three test tubes, each with two drops of iodine, and shake well. Observe the changes in the test tube.
Four. Implementation plan (same as the above design plan)
Through the above experimental exploration, it was found that the color in test tube 1 did not change, but blue appeared in test tubes 2 and 3, indicating that the starch in test tube 1 changed into maltose.
Verb (abbreviation of verb) conclusion
The sweetness of steamed bread is related to teeth chewing, tongue stirring and saliva secretion. Grinding teeth, grinding food, mixing food with saliva with tongue, and digesting food with saliva; The sweetness of steamed bread is the change of starch.