Name a good preservative.

Which convert complex proteins in the dead bodies of plants and animals into ammonia, nitrites and nitrates?

Which bacteria turns milk into curd.

Name the species of bacteria which is used to manufacture the antibiotic, 'streptomycin'?
 

Why are viruses  very much used as biological research tools?

Name the organisms which is considered as being on the border line between living and non living organisms.

Name the rod shaped bacteria

Name an ammonifying bacteria

Name the activity by which the leaves of tea, tobacco etc are fermented.

Nodules are responsible for nitrogen fixation.  Name the bacteria present inside the root nodules.