A) viruses
B) mycoplasma
C) viroids
D) actinomycetes.
Correct Answer: B
Solution :
: Mycoplasma are pleuro-pneumonia like organisms or PPLO, which lack cell wall and have no shape (i.e., pleiomorphic). They were first isolated from bovine sheep, suffering from pleuropneumonia. The human infertility and abortions are now known to be due to mycoplasma infections of the urinogenital tract. Mycoplasma may be saprophytic, parasitic or pathogenic. They can grow on culture media and form colonies. They pass through bacteria-proof filters, so they are the smallest, free living, micro-organisms.
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