IB BIOLOGY: CLASSIFICATION KEY
PREDICTED PRACTICE EXAMINATION
2026 QUESTIONS WITH ANSWERS
GRADED A+
◍ animal kingdom.
Answer: Multicellular eukaryotic heterotrophs with no cell wall
◍ domain.
Answer: A taxonomic category above the kingdom level. The three domains
are Archaea, Bacteria, and Eukarya.
◍ What is taxonomy?.
Answer: The science of describing, naming, and classifying organisms.
◍ What is Classification?.
Answer: The systematic grouping of living things based on characteristics,
hierarchical, or phylogenetic relationships.
◍ Why is classification important?.
Answer: It helps prevent confusion among scientists and shows how
organisms are related.
◍ What system did Aristotle use for classification?.
Answer: A simple system with two taxa: plants and animals.
◍ What was a limitation of Aristotle's classification system?.
Answer: It was too broad and did not include microscopic organisms.
◍ kingdom.
Answer: second largest group in classification: includes archaea, bacteria,
protist, fungi, plant and animal
, ◍ phylum.
Answer: a category of taxonomic classification that is ranked above class
and under kingdoms
◍ What is the modern hierarchical system of classification?.
Answer: The Linnaeus system: Eight levels: Domain, Kingdom, Phylum,
Class, Order, Family, Genus, Species.
◍ What is a taxon?.
Answer: A group or level of organization into which organisms are
classified.
◍ What is binomial nomenclature?.
Answer: A classification system where each species is assigned a two-part
scientific name.
◍ What are the two parts of a scientific name?.
Answer: The genus name (capitalized) and the species name (lowercase).
◍ 3 Benefits of Binomial Nomenclature.
Answer: 1. Easier to use2. Sometimes different species have the same basic
name3. Less confusing
◍ Systematics.
Answer: The classification of living organisms in terms of their natural
relationships (describing, naming, classifying)
◍ Phylogeny.
Answer: The study of evolutionary relationships among organisms
◍ order.
Answer: the taxonomic category below the class and above the family
◍ genus.
Answer: division of animals or plants, below a family and above a species
◍ family.
Answer: the taxonomic category below the order and above the genus
PREDICTED PRACTICE EXAMINATION
2026 QUESTIONS WITH ANSWERS
GRADED A+
◍ animal kingdom.
Answer: Multicellular eukaryotic heterotrophs with no cell wall
◍ domain.
Answer: A taxonomic category above the kingdom level. The three domains
are Archaea, Bacteria, and Eukarya.
◍ What is taxonomy?.
Answer: The science of describing, naming, and classifying organisms.
◍ What is Classification?.
Answer: The systematic grouping of living things based on characteristics,
hierarchical, or phylogenetic relationships.
◍ Why is classification important?.
Answer: It helps prevent confusion among scientists and shows how
organisms are related.
◍ What system did Aristotle use for classification?.
Answer: A simple system with two taxa: plants and animals.
◍ What was a limitation of Aristotle's classification system?.
Answer: It was too broad and did not include microscopic organisms.
◍ kingdom.
Answer: second largest group in classification: includes archaea, bacteria,
protist, fungi, plant and animal
, ◍ phylum.
Answer: a category of taxonomic classification that is ranked above class
and under kingdoms
◍ What is the modern hierarchical system of classification?.
Answer: The Linnaeus system: Eight levels: Domain, Kingdom, Phylum,
Class, Order, Family, Genus, Species.
◍ What is a taxon?.
Answer: A group or level of organization into which organisms are
classified.
◍ What is binomial nomenclature?.
Answer: A classification system where each species is assigned a two-part
scientific name.
◍ What are the two parts of a scientific name?.
Answer: The genus name (capitalized) and the species name (lowercase).
◍ 3 Benefits of Binomial Nomenclature.
Answer: 1. Easier to use2. Sometimes different species have the same basic
name3. Less confusing
◍ Systematics.
Answer: The classification of living organisms in terms of their natural
relationships (describing, naming, classifying)
◍ Phylogeny.
Answer: The study of evolutionary relationships among organisms
◍ order.
Answer: the taxonomic category below the class and above the family
◍ genus.
Answer: division of animals or plants, below a family and above a species
◍ family.
Answer: the taxonomic category below the order and above the genus
