Microorganisms: Friend and Foe

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