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Why are VIRUSES not included in the five-kingdom classification?
AThey were unknown when Whittaker proposed his system
BThey are too small to classify
CThey are technically plants
DThey are not considered truly 'living' since they lack cellular structure (no cells, just inert crystalline particles outside the living cell)
Answer & Solution
Correct answer: D. They are not considered truly 'living' since they lack cellular structure (no cells, just inert crystalline particles outside the living cell)
Whittaker's system applies to organisms with cellular structure. Viruses are non-cellular — outside living cells they exist as inert crystalline particles. Hence they sit outside the five-kingdom framework. (Viroids and prions are also non-cellular and similarly excluded.)
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