Biology Biological Classification Viruses, Viroids, Prions, Lichens and Mycorrhiza Single Correct MCQ
Published on: August 13, 2026

Why viruses did not find a place in classification?

A
They are obligate parasities, cannot surive without host.
B
Viruses are unicellular organisms so can not be included in livings.
C
They are not truly living because they don't have cell structure.
D
They can pass through the bacteria proof filter

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The correct answer is:
C

Viruses are acellular (non-cellular) and lack a true cellular organization, which is a basic requirement for inclusion in biological classification systems. This is why they are considered at the boundary of living and non-living and are not placed in the standard classification of organisms.

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