Home Biology Biological Classification Which among the following are the smallest l…
Biology Biological Classification Single Correct MCQ
Published on: August 20, 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

Mycoplasma are the smallest living cells. They lack a definite cell wall. They can be pathogenic to plants and animals. They are capable of surviving without oxygen (anaerobic).

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