Q3. Sita conducted an experiment in which she took 3 test tubes. Following were the contents in
each test tube:
Test tube 1- saliva from Sita's mouth
Test tube 2- Mashed Boiled Rice in water.
Test tube 3- Saliva from Sita's mouth and Mashed Boiled Rice in water.
a) What do you think will happen in test tube 3. With the help of simple geometric figures
explain with diagram what happens in test tube 3 over a period of time.
Answers
Answer:
It will took time to explain with diagram
but it is simple to answer that both the contents in the test tube having same kind of tendency and it will took time to observe this experiment by doing it practically
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.
hope!! it's correct