Give reasons for the following.
(a) Yeast is added to the batter used to make 'dosas'.
b) It is important to brush one's teeth before going to bed.
(c) Reducing the quantity of salt in pickle can cause it to go bad soon.
(d) Foods, from pulfed or enlarged cans, should not be consumed.
(e) When using frozen food items one should take out only the required
quantities; thawed food should never be refrozen.
Answers
Answer:a) year is involved in a process called fermentation and realise co2 to make dough soft and make it rise .
b) during sleep saliva is not release .since saliva protects our teeth by continuously killing the bacteria at night the food stuck in our teeth are heavily attacked by bacteria and cause carries.
c)salt is a natural preservative . it makes the solution highly hypertonic so that any living organism can't survive in the harsh condition ..less salt will decrease the concentration hence chances of survival of bacteria will increase.
d) puffing of can denotes the gas released by the respiratory process of bacteria. hence the food inside has gone bad due to bacterial growth.
e)freezing makes the bacteria present in it inactive but not dead . once unfreezed the bactrial activity starts again so continuous freezing and unfrreezing should be avoided.
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