write an experiment to show that starch is broken down into glucose by saliva present in mouth
Answers
Answer:
Experiment to show the effect of saliva on starch
Two test tubes were taken and were labeled A and B.
In test tube A one teaspoon full of boiled rice was kept.
In test tube B one teaspoon full of boiled rice which were chewed for 3-5 minutes were kept.
3-4 ml of water was added to both the tubes.
Then 2-3 drops of iodine solution was added to both test tubes A and B.
Observation:
The test tube A shows blue – black colour whereas test tube B does not show this colour.
Conclusion:
Since test tube B has boiled rice which were chewed for 3-5 minutes, the saliva present in mouth has acted upon starch to break down into sugars. So it does not show any colour in presence of iodine solution.
Boiled rice in test tube A has not been exposed to saliva, so starch is present which is indicated by blue-black colour on addition of iodine solution.
Tongue
Tongue is a fleshy muscular organ which is free at its front end and is attached at the back of the floor of buccal cavity.
It can move in all directions
Answer
Experiment to show the effect of saliva on starch:-
1. 2 test tubes labeled A and B are taken, where tube A contains 1 tsp of boiled rice and tube B has 1 tsp of rice which has been chewed for 3-5 mins.
2. 4 ml water is added to both the test tubes and then 2-3 drops of iodine solution is also added to each test tube.
The color in the tube A changes to bluish-black color, whereas the color in the tube B remains unchanged.
This is because the rice in the tube B has been chewed and the saliva has acted on it and broken down the starch molecules into smaller sugar particles. But, the starch in the tube A was not chewed so the starch molecules are intact in it. The starch reacts with the iodine to give a bluish-black color. This indicates the action of saliva on starch.
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