How many of these pairs are mismatched?
(i) Comma-shaped - Diplococcus
(ii) Rod-shaped - Spirochaete
(iii) Helical - Streptobacillus
(iv) Spherical - Vibrio cholerae

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Solution

The correct option is D 4
Cocci are spherical bacteria, so Diplococcus is spherical; Bacilli are rod-shaped bacteria, so Streptobacillus is rod-shaped, Spirochaete is spiral or helical in shape, and vibrios are comma-shaped bacteria such as Vibrio cholerae.

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