Question

E. Answer in a sentence or two.
1. Name two useful microorganisms.
2. How does nitrification differ from denitrification?
3. What is pasteurisation?
4. What is fermentation?
5. How are viruses different from other microorganisms?
G. Answer in 30-40 words.
1. What are pathogens? Name any five diseases caused by microorganisms.
2. What are communicable diseases? How could we keep these diseases at bay?
3. What are the various methods adapted in India to preserve food materials?
4. Give the process of nitrogen fixation in soil with equations.
5. Write short notes on the following methods of food preservation.
(i) Pasteurisation
(ii) Chemical method
(iii) Sundrying
6. (i) What is a nitrogen cycle?
(ii) Name two bacteria that fix atmospheric nitrogen in the soil.
(iii) What is ammonification?
(iv) Name the step of nitrogen cycle when nitrates and nitrites convert into free nitrogen. please do it fast​

Answer 1

Answer:

1. yeast and bacteria

3 pasteurisation is the process of heating a liquid to a certain temperature and then cooling it quickly to kill the bacteria present in it