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Dear Student,
Ans 5. Saliva is the watery fluid secreted in the mouth by the action of salivary glands. Saliva contains an enzyme salivary amylase which digests 30% of the carbohydrates intake partially in the mouth which further gets digested in later parts of the digestive system. It also masticates the food. That is why it is said to chew the food well.
Ans 6. The rice in test tube A would turn blue-black in colour due to the presence of carbohydrates (Iodine turns blue-black in presence of carbohydrates) whereas no colour change would be seen in test tube B (which has properly chewed up rice mixed with our saliva) as the presence of salivary amylase present in our saliva has already started breaking down carbohydrates into simpler sugar, thus, showing no significant colour change upon addition of iodine.
Ans 7. The functions of the tongue are as follows:
Ans 5. Saliva is the watery fluid secreted in the mouth by the action of salivary glands. Saliva contains an enzyme salivary amylase which digests 30% of the carbohydrates intake partially in the mouth which further gets digested in later parts of the digestive system. It also masticates the food. That is why it is said to chew the food well.
Ans 6. The rice in test tube A would turn blue-black in colour due to the presence of carbohydrates (Iodine turns blue-black in presence of carbohydrates) whereas no colour change would be seen in test tube B (which has properly chewed up rice mixed with our saliva) as the presence of salivary amylase present in our saliva has already started breaking down carbohydrates into simpler sugar, thus, showing no significant colour change upon addition of iodine.
Ans 7. The functions of the tongue are as follows:
1) To taste the food: The tongue is a muscular structure which has a large number of different types of papillae and taste buds on its surface. These taste buds help in recognising and identifying the different types of tastes present in the food like salty, bitter, sour and sweet.
2)Swallowing of food: The tongue forms a very important part of the digestive tract which helps in swallowing the food by mixing the food with the saliva secreted by the salivary glands in the mouth. The saliva breaks down the starch present in the food into simple sugars. Thus, tongue helps in mixing the food with the saliva.
3)Speech: The tongue with its movements help us to speak or talk.
P.S. Kindly post the rest of the questions in a separate thread.
P.S. Kindly post the rest of the questions in a separate thread.
Regards