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
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
