Bacteria may be classified into following groups:-
Bacilli:-Example are bacillus tuberculosis, B. typhi. These
are rod shaped bacteria
Spirilla:-These bacteria have spirally coiled body e.g.
Spirillium, Spirochaete etc..
Cocci:- These bacteria are spherical e.g. Azotobacter,
Strepjtococcus, Staphylococcus
Importance of Bacteria:-Some of the bacteria are very useful
to mankind while their harmful effects are not also less
Harmful effects:- bacterial are parasites which attack
living plants, animal and even human beings and cause
various diseases. Some of the disease producing bacteria are
as follows:-
(a)Bacillus typhi:-Causing typhoid
(b)B.tetani:-Causing of tetani
(c)B.diptheriae:-Causing diphtheria
(d)B.dysenteriae:-Causing dysentery
(e)Vibrio cholerae:-Causing cholera
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