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Answer:
6 a) Pickles are preserved by use of oil & vinegar.
b) Pasteurization is a process of heat & cold treatment of preserving milk.
c) Botulism is a dangerous form of food poisoning.
d) Fermentation is a oldest method of food preservation. { Drying also }
e) Jellies , squashes and jams are preserved by sugar syrup.
7) In the atmosphere Nitrogen cycle is playing a major role in a constant qty of of nitrogen.
As nitrogen cycle is having different stages :
Nitrogen Fixation
This process help us to convert nitrogen from gaseous stage to compound by biological nitrogen fixation process which include blue green algae & Rhizobium bacteria as a helper.
Nitrogen Assimilation
Most of the pulses need nitrogen which is used by them in a form of compound in a soil helps them make protein after that it will transfer to animals by food chain.
Ammonification
In this process die animals & plants , bacteria will convert it into ammonia compounds these are also decomposer animal's.
Nitrification
Ammonia can not be used directly by organisms because it's too toxic. So, it will again convert into nitrogen compound by nitrifying bacteria , after that it will used by plant . This process alone known as Nitrification
Disnitrification or Nitrogen conversion into gaseous State
Bacteria will convert some part of ammonia into nitrogen compound & gaseous form also which will then go into atmosphere.
Due to that complete cycle of nitrogen will make it constant in atmosphere.
8) Virus
This microorganism is having one feature that it will active or become alive when it will enter inside the body of any living being.
9) HIV as it's a virus , others are diseases
10) a. Antibiotics b. Pathogens