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:

3. Communicable diseases are disease that spread from one person to another

They are spread through direct contact.

Examples - Common cold

Explanation:

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Answer 2

Explanation:

Ans 1. Sun-drying or dehydration.2.Heating.

3.Cooling.4.Deep freezing.

5.Addition of common salt.6.Addition of sugar.

7.Addition of mustard oil and vinegar.8.Use of special chemical preservatives.

Ans2.The steps, which are not altogether sequential, fall into the following classifications: nitrogen fixation, nitrogen assimilation, ammonification, nitrification, and denitrification.

Ans3.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.

Ans4. 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.