Home Biology Biological Classification NCERT Which among the following are the smallest l…
Biology Biological Classification NCERT Single Correct MCQ
Published on: August 14, 2026

Which among the following are the smallest living cells known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?

A
Bacillus
B
Pseudomonas
C
Mycoplasma
D
Nostoc

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The correct answer is:
C

The smallest living cells known, lacking a definite cell wall, pathogenic to plants and animals, and capable of surviving without oxygen are Mycoplasma. They belong to Kingdom Monera and are also called PPLO (Pleuro Pneumonia Like Organisms).

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