Swarming growth on culture is characteristic of which Gram positive organism ?

Ans. is 'b' i.e., Clostridium tetani Swarming growth . Swarming growth is due to motility of bacteria. In young culture discrete colonies are seen but thereafter actively motile cells spread on the surface of the plate in successive waves to form a thin filmy layer in concentric circles. . Gram positive organism showing swarming growth --> C. tetani and Bacillus cereus . Gram negative organism showing swarming growth -f Proteus mirabilis and proteus vulgaris