Among the following, which is NOT a standard criterion for classifying organisms?
ACell type (prokaryote vs eukaryote)
BMode of nutrition (autotrophic vs heterotrophic)
CBody organisation (tissues, organs, systems)
DSkin colour of the organism in mature form
Answer & Solution
Correct answer: D. Skin colour of the organism in mature form
The chapter lists cell type, cell number, mode of nutrition, body organisation, and method of reproduction as standard criteria for classification. Skin colour is NOT a classification criterion; it varies even within one species.
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