Question

give reason 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) food from puffed or enlarged can should not be consumed. (e) when using frozen food item one should take out only the required quantities thawed food should never be frozen.

Answer 1

1. Yeast undergo anaerobic respiration and profuce CO2 which give fluffiness.
2. It is imp. to brush teeths because if there is any food item left sticking to teeths then bacteria will act on it and produce enzymes which may destroy enamel and may result in dental caries or cavities
3. Salt act as a food preservatives and prevent rancidity of pickle by preventing oxidation. Reducing salt might allow pickle to become rancid.
4. Enlarged or puffed can represent that there had been some bacterial action on the item which might lead to formation of toxic substance.
5.One should take out only required quantity of frozen food as it might spoil the rest of food item and refrozing the frozen item destroys it's nutrients

Answer 2

Answer:

(a) because yeast reproduce rapidly and produce CO2.