What are antibiotics? What precautions must be taken while taking
antibiotics?
Name the microorganisms which can fix atmospheric nitrogen in the soil.
Can microorganisms be seen with the naked eye? If not, how can they be
seen?
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