Question

2. 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
(d) Foods, from puffed or enlarged cans, should not be consumed
(e) When using frozen food items one should take out only
quantities; thawed food should never be refrozen.
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Answer 1

A.Yeast reproduce rapidly and produces CO2 During respiration

Bubbles of the gas fill in the dough and increase its volume

B. Because our teeth have more germs in our mouth

when we brush the teeth freshly.

C.Salt is a preservative when we add more in pickles it becomes to another bad acid.