Lesson 3 of 17
Saliva and starch
Show on a big screenRice has starch, not sugar. Starch is the main food part in rice and roti. Yet a long chew can make rice taste sweet. Why?
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The idea
Saliva is a digestive juice in the mouth. It breaks starch into sugar.
Chewed rice tastes sweet because saliva turns its starch into sugar. Teeth crush food into fine pieces.
Iodine turns blue-black when starch is there. A teacher does this test.
Step 1 of 4
- A piece of roti goes into the mouth.
- Teeth crush it into smaller pieces.
- Saliva starts working on the starch inside it.
- Starch broken into sugar tastes sweet.
Saliva breaks starch into sugar. Iodine turns blue-black when starch is there.
Try the lab to finish this lesson.