figure 2.3 prove that starch in digestive system in buccal cavity
Answers
Answer:
Carbohydrate digestion begins in the mouth. The salivary glands in the mouth secrete saliva, which helps to moisten the food.
The food is then chewed while the salivary glands also release the enzyme salivary amylase, which begins the process of breaking down the polysaccharides in the carbohydrate food.
But this activity is much less important than that of pancreatic amylase in the small intestine which digests carbohydrates. Hence, Digestion of starch takes place in the buccal cavity and small intestine.
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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.
Functions:
It mixes saliva with food while chewing.
It plays an important role while talking.
The taste of the food can be known due to different taste buds present in our tongue.
It helps in swallowing our food.