Question

can anyone give the main points of microorganisms class 8 ncert

Answer 1

Hi friend,

Viruses are living till they are present inside the hosts body but become active/living when they enter the hosts body.

As viruses do not have any bio-chemical mechanisms of their own,they take the mechanisms of the hosts body,so it's difficult to cure virus diseases.


Disease present in us by birth are called congenital diseases.

Disease caused by deficiency of a particular nutrient is called deficiency diseases.

Adding certain preservatives or salt,sugar,etc to food so as to preserve it for a longer time.

Lactobacillus is the bacteria helping I'm formation of curd.

Rhizobium bacteria helps in nitrogen fixation living in root nodules.

Yeast is the unicellular fungus forming the basis of baking industry.

Penicillin was the first antibiotic discovered by Alexander Fleming.

The first vaccine was discovered for small pox.

Edward Jenner discovered the first vaccine.

Malaria casual organism is plasmodium.

Malaria is spread by female anopheles mosquitoe.

Dengu is caused by virus.

BCG,OPV and DPT are few vaccines.

DNA and RNA are two nucleic acids.

Sodium Benzoate and Sodium Metabisulphate are two preservatives permitted in India.

Immunity is is resistance of the body to fight against diseases.

Vaccine is weakend form of disease and germs introduced in body to provide immunity.

Branch of science dealing with accepts diseases,bacterial disease,viruses,causes of diseases, are called as pathology,bacteriology,virology,ethology respectively.

More I will soon.

Hope it helped you....................

Answer 2

Disease present in us by birth are called congenital diseases.

Disease caused by deficiency of a particular nutrient is called deficiency diseases.

Lactobacillus is the bacteria helping I'm formation of curd.