Question

1. List the various methods used for food preservation.
2. What are the various steps of Nitrogen cycle?
3. What are communicable diseases and how are they spread?
4. Why do we use yeast in bakeries and breweries?


plz tell all answers​

Answer 1

Answer:

1=Among the oldest methods of preservation are drying, refrigeration, and fermentation. Modern methods include canning, pasteurization, freezing, irradiation, and the addition of chemicals. Advances in packaging materials have played an important role in modern food preservation.

2=Nitrogen fixation (N2 to NH3/ NH4+ or NO3-)

Nitrification (NH3 to NO3-)

Assimilation (Incorporation of NH3 and NO3- into biological tissues)

Ammonification (organic nitrogen compounds to NH3)

Denitrification(NO3- to N2)

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Answer 2

Answer:

1.Drying , refrigeration, fermentation, canning, canning, pasteurization, freezing, irradiation, and the addition of chemicals.

2.Nitrogen fixation

Nitrification

Assimilation

Ammonification

Denitrification

3.Communicable diseases are illnesses caused by viruses or bacteria that people spread to one another through contact with contaminated surfaces, bodily fluids, blood products, insect bites, or through the air. There are many examples of communicable diseases.

4.Yeast is used in breweries since the fermentation activity of yeast produces different types of beverages like wine, beer, alcohol toddy, etc. In bakeries, when yeast is added to the flour its fermentation results in the production of carbon dioxide which produces soft bread and other bakery products.

Explanation:

1.Among the oldest methods of preservation are drying, refrigeration, and fermentation. Modern methods include canning, pasteurization, freezing, irradiation, and the addition of chemicals. Advances in packaging materials have played an important role in modern food preservation.