. Give reasons:
1. Fresh milk is boiled before consumption where as packet milk can be consumed without
boiling.
2. Raw vegetables and fruits are kept in refrigerator where as jams and pickles can be kept
outside.
3. Farmers prefer to grow beans and peas in nitrogen deficient soil.
4. Mosquito can be controlled by preventing stagnation of water though they do not
live in water.
5. Mango pickle is not spoiled compared to fruit after few days.
Answers
Answer:
1. Fresh milk is boiled before consumption to kill the microorganisms in it. But packed milk is pasteurised and does not contain any microorganisms. It can thus be consumed without boiling.
2.Raw vegetables and fruits are kept in refrigerators whereas pickles and jams are kept outside. It is because pickles and jams contains some preservatives such as sugar, salt and other ingredients in them. Though, pickles and jams do not easily get spoil by bacteria, air or other factors when you are kept them outside.
3.Bean and Peas are leguminous plants. They fix nitrogen in the soil with the help of Rhizobium bacteria present in the root nodules of the plants. Thus, they fix nitrogen and replenish the deficiency of nitrogen in the soil. Therefore, farmers prefer to grow bean and peas in nitrogen deficient soil.
4.Mosquitos can be controlled by preventing stagnation of water though they don't live in water because mosquitos lay their eggs in stagnated water, they get most nutrients after hatching from water and then they spread diseases like dengue , malaria , chikungunya etc.
5.A mango gets spoilt and rotten after few days but a mango pickle does not spoil for a long period of time because mango pickles contains salt which acts as preservatives and prevent the growth of microorganisms in it.