IB BIOLOGY: CLASSIFICATION KEY
PREDICTED COMPREHENSIVE STUDY
GUIDE 2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
◍ Variation.
Answer: Any difference between individuals of the same species.
◍ Discrete variation.
Answer: Inherited characteristic that have a limited number of variations,
such as the ability or inability to roll one's tongue
◍ taxonomy.
Answer: Study of how organisms are named and classified.
◍ binomial nomenclature.
Answer: A system for giving each organism a two-word scientific name that
consists of the genus name followed by the species name
◍ continuous variation.
Answer: range of small differences in a shared trait
◍ Variation within a species.
Answer: Differences between organisms of the same species
◍ cladogram.
Answer: A diagram that is based on patterns of shared, derived traits and
that shows the evolutionary relationships between groups of organisms
◍ dichotomous key.
Answer: a key for the identification of organisms based on a series of
choices between alternative characteristics
, ◍ Monera.
Answer: old scientific term for the kingdom of bacteria; now split into
Eubacteria and Archaea
◍ Variation between species.
Answer: small differences in DNA base sequences between individual
organisms within a population.
◍ Eubacteria.
Answer: A domain that contains all prokaryotes (bacteria) except
archaebacteria
◍ Archaea.
Answer: domain of unicellular prokaryotes that can live in extreme
environments
◍ Eukarya.
Answer: Domain of all organisms whose cells have nuclei, including
protists, plants, fungi, and animals
◍ morphological species concept.
Answer: a species or group of organisms that share a particular outer form
and inner structure.
◍ Protista.
Answer: Kingdom composed of eukaryotes that are not classified as plants,
animals, or fungi
◍ bionomial nomenclature.
Answer: Classification system in which each species is assigned a two-part
scientific name
◍ Fungi.
Answer: Kingdom of heterotrophic eukaryotes that have a cell wall made of
chitin
◍ Plantae.
Answer: Kingdom of multicellular photosynthetic autotrophs that have cell
PREDICTED COMPREHENSIVE STUDY
GUIDE 2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
◍ Variation.
Answer: Any difference between individuals of the same species.
◍ Discrete variation.
Answer: Inherited characteristic that have a limited number of variations,
such as the ability or inability to roll one's tongue
◍ taxonomy.
Answer: Study of how organisms are named and classified.
◍ binomial nomenclature.
Answer: A system for giving each organism a two-word scientific name that
consists of the genus name followed by the species name
◍ continuous variation.
Answer: range of small differences in a shared trait
◍ Variation within a species.
Answer: Differences between organisms of the same species
◍ cladogram.
Answer: A diagram that is based on patterns of shared, derived traits and
that shows the evolutionary relationships between groups of organisms
◍ dichotomous key.
Answer: a key for the identification of organisms based on a series of
choices between alternative characteristics
, ◍ Monera.
Answer: old scientific term for the kingdom of bacteria; now split into
Eubacteria and Archaea
◍ Variation between species.
Answer: small differences in DNA base sequences between individual
organisms within a population.
◍ Eubacteria.
Answer: A domain that contains all prokaryotes (bacteria) except
archaebacteria
◍ Archaea.
Answer: domain of unicellular prokaryotes that can live in extreme
environments
◍ Eukarya.
Answer: Domain of all organisms whose cells have nuclei, including
protists, plants, fungi, and animals
◍ morphological species concept.
Answer: a species or group of organisms that share a particular outer form
and inner structure.
◍ Protista.
Answer: Kingdom composed of eukaryotes that are not classified as plants,
animals, or fungi
◍ bionomial nomenclature.
Answer: Classification system in which each species is assigned a two-part
scientific name
◍ Fungi.
Answer: Kingdom of heterotrophic eukaryotes that have a cell wall made of
chitin
◍ Plantae.
Answer: Kingdom of multicellular photosynthetic autotrophs that have cell
