Viruses are omitted from the five kingdoms because they are acellular entities. They lack cellular structures, cytoplasm and independent metabolic machinery, existing as inert particles outside a living host.
Chapter 12 Patterns in Life Diversity and Classification Solutions
Class 9 Science Patterns in Life Diversity and Classification Exercise Solutions
Viruses are excluded from the five kingdom system because Whittaker’s classification is built entirely upon cellular organization, distinguishing between prokaryotic and eukaryotic cells. Viruses are non-cellular entities consisting merely of genetic material encased within a protein coat. Lacking cytoplasm, cell membranes and independent metabolic pathways, they remain completely inert outside host cells, showing living characteristics only after infection.
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