List of top Science Questions on Microorganisms asked in CBSE Class VIII

Match the organisms in Column A with their action in Column B.

A

B

(i)Bacteria(a)Fixing nitrogen
(ii)Rhizobium(b)Setting of curd
(iii)Lactobacillus(c)Baking of bread
(iv)Yeast(d)Causing malaria
(v)A protozoan(e)Causing cholera
(vi)A virus(f)Causing AIDS
 (g)Producing antibodies
The bread or idli dough rises because of
The most common carrier of communicable diseases is
Carrier of malaria-causing protozoan is
The following is an antibiotic
Yeast is used in the production of
Fill in the blanks.
1. Microorganisms can be seen with the help of a ___.
2. Blue-green algae fix ___ directly from the air and enhance the fertility of the soil.
3. Alcohol is produced with the help of ___.
4. Cholera is caused by ___.