Question

2.
Give reasons for the following.
(a) Yeast is added to the batter used to make 'dosas'.
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(b) It is important to brush one's teeth before going to bed.
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(c) Reducing the quantity of salt in pickle can cause it to go bad soon.
(d) Foods, from puffed 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.
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Answer 1

Answer:

a) Yeast is added to the batter used to make dosas so that the process of fermentation could take place easily

b) it is important to brush one's teeth before going to bed as it will help in keeping out plaque build up, tooth decay and gum disease

c) reducing the quantity of salt in pickle can cause it to go bad soon as salt is a natural preservative which reduces the water content and bars the growth of microorganisms

d) foods , from puffed or enlarged cans , should not be consumed because it is not only the hydrogen gas that has caused swelling but also there is carbon dioxide that spoils the food

e) when using frozen food items one should take out only the required quantities, thawed food should never be frozen as it would change the taste or texture