Microorganism motile at 25deg C but not motile at 37deg C-: (A) Listeria monocytogens, (B) Campylobacter, (C) Yersinia pestis, (D) Streptococcus agalctiae
Answer is A. Ans. is 'a' i.e., Listeria monocytogens Listeria monocytogens exhibits characteristic, slow, tumbling motility when grown at 25degC but at 37degC it is non motile.