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IB BIOLOGY: CLASSIFICATION KEY PRACTICE EXAMINATION 2026 QUESTIONS WITH ANSWERS GRADED A+

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IB BIOLOGY: CLASSIFICATION KEY PRACTICE EXAMINATION 2026 QUESTIONS WITH ANSWERS GRADED A+

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IB BIOLOGY: CLASSIFICATION KEY ACTUAL EXAM PAPER
2026 QUESTIONS WITH ANSWERS GRADED A+


● Classification. Answer: grouping objects or events according to similarities

● Taxonomy. Answer: the science of identifying, classifying, and naming organisms

● Modern Classification. Answer: based on phylogeny and cladistics

● Phylogeny. Answer: evolutionary descent from a common ancestor

● Cladistics. Answer: shows new characteristics or "innovations" that evolved

● Ancestral Characters. Answer: evolved in a common ancestor of TWO groups

● Derived Characters. Answer: evolved in an ancestor of ONE group, but not the other

● Cladogram. Answer: a diagram that groups organisms according to ancestry

● Clade. Answer: group consisting of an ancestor and its descendants (in a cladogram)

● DNA Relation in Different Species. Answer: the more similar the DNA sequences, the
more closely related 2 organisms are

● Carolus Linneaeus. Answer: developed a binomial system of nomenclature to avoid the
confusion that occurs with common names for organisms

● Three Domains. Answer: Bacteria, Archaea, & Eukarya

● Six Kingdoms. Answer: Plantae, Animalia, Fungi, Protista, Eubacteria, & Archaebacteria

● Full Species Classification. Answer: 1. Kingdom, Phylum, Class, Order, Family, Genus,
Species

● Dichotomous Key. Answer: tool for identifying organisms

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