IB BIOLOGY: CLASSIFICATION KEY
PREDICTED ACTUAL EXAM PAPER
2026 QUESTIONS WITH ANSWERS
GRADED A+
◍ Dichotomous key.
Answer: A series of paired statements that describe the physical
characteristics of different organisms used for identification purposes.
◍ Aristotle.
Answer: Designed the first classification system which divided living things
into two broad categories: plants and animals.
◍ Carolus Linnaeus.
Answer: Founder of taxonomy; Developed two part system of naming
organisms.
◍ binomial nomenclature.
Answer: Two part scientific naming system.
◍ hierarchical classification.
Answer: The organization of objects into groups and subgroups on the basis
of similarities and differences between the groups.
◍ classify.
Answer: To arrange or organize a group by reason of common attributes,
characteristics, qualities, or traits.
◍ Taxonomy.
Answer: the system of grouping and naming organisms based on similar
characteristics: such as observable traits, behaviors, and DNA
, ◍ Binomial Nomenclature.
Answer: a two-part scientific name using the Genus and the Species name,
first word capitalized second word lower case, written in italics
◍ Genus.
Answer: group of closely related species; the first part of the scientific name
◍ Species.
Answer: a group of similar organisms that can breed and produce fertile
offspring
◍ Dichotomous Key.
Answer: an organized set of characteristics used to identify organisms. Each
step contains two choices until the organism is correctly identified
◍ Domain.
Answer: Largest taxonomic category.There are 3 catergories: Bacteria,
Archaea, Eukarya
◍ taxonomy.
Answer: science of classification
◍ Bacteria.
Answer: Domain of unicellular prokaryotes, the common bacteria found in
most places on earth.
◍ Archaebacteria.
Answer: Kingdom of unicellular prokaryotes whose cell walls do not
contain peptidoglycan and that typically live in extremely harsh
environments.
◍ Eubacteria.
Answer: Kingdom of unicellular prokaryotes whose cell walls are made up
of peptidoglycan and are common in most environments.
◍ Protista.
Answer: Kingdom of eukaryotes that may be plant-like, fungus-like, or
animal-like, but cannot be classified as plants, fungi, or animals.
PREDICTED ACTUAL EXAM PAPER
2026 QUESTIONS WITH ANSWERS
GRADED A+
◍ Dichotomous key.
Answer: A series of paired statements that describe the physical
characteristics of different organisms used for identification purposes.
◍ Aristotle.
Answer: Designed the first classification system which divided living things
into two broad categories: plants and animals.
◍ Carolus Linnaeus.
Answer: Founder of taxonomy; Developed two part system of naming
organisms.
◍ binomial nomenclature.
Answer: Two part scientific naming system.
◍ hierarchical classification.
Answer: The organization of objects into groups and subgroups on the basis
of similarities and differences between the groups.
◍ classify.
Answer: To arrange or organize a group by reason of common attributes,
characteristics, qualities, or traits.
◍ Taxonomy.
Answer: the system of grouping and naming organisms based on similar
characteristics: such as observable traits, behaviors, and DNA
, ◍ Binomial Nomenclature.
Answer: a two-part scientific name using the Genus and the Species name,
first word capitalized second word lower case, written in italics
◍ Genus.
Answer: group of closely related species; the first part of the scientific name
◍ Species.
Answer: a group of similar organisms that can breed and produce fertile
offspring
◍ Dichotomous Key.
Answer: an organized set of characteristics used to identify organisms. Each
step contains two choices until the organism is correctly identified
◍ Domain.
Answer: Largest taxonomic category.There are 3 catergories: Bacteria,
Archaea, Eukarya
◍ taxonomy.
Answer: science of classification
◍ Bacteria.
Answer: Domain of unicellular prokaryotes, the common bacteria found in
most places on earth.
◍ Archaebacteria.
Answer: Kingdom of unicellular prokaryotes whose cell walls do not
contain peptidoglycan and that typically live in extremely harsh
environments.
◍ Eubacteria.
Answer: Kingdom of unicellular prokaryotes whose cell walls are made up
of peptidoglycan and are common in most environments.
◍ Protista.
Answer: Kingdom of eukaryotes that may be plant-like, fungus-like, or
animal-like, but cannot be classified as plants, fungi, or animals.
