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
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Answers
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.In general, the nitrogen cycle has five steps:
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)
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:
Hope it's helpful
Answer:
1. The various methods are food preservation are
~ Reducing the temperature by keeping it in refrigerator.
~ By adding nitrogen gas in the packaging packs for not losing its crispyness especially in chips.
3. Communicable diseases are diseases which can be spread from one person to another. They spread through various ways like water, air, insects, etc.
4. We use yeast in bakeries to make bakes soft and fluffy.
It also makes the cakes tasty.
Sorry, I don't know for second one.
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