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  4. The smallest free living organisms are

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Q. The smallest free living organisms are

UP CPMTUP CPMT 2014

Solution:

Mollicutes or mycoplasmas ($PPLO$, pleuropneumonia like organisms) are smallest cell ($300 \,nm$ in diameter) and belong to Kingdom Monera. They lack cell wall, thus are pleomorphic i.e., can change their shape.