Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The binomial system of nomenclature, devised by Carl Linnaeus, identifies species by two names: the (capitalized) and the (lowercase), both written in italics or underlined.
The hierarchy of taxa for classifying eukaryotes follows a nested order: Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species.
Organisms are classified into three distinct domains based on sequences: (extremophiles), (true bacteria), and (complex cells with nuclei).
Natural classification groups organisms that share a common ancestor; this allows for the prediction of characteristics within a group and reflects evolutionary relationships.
Plant phyla are distinguished by vascular tissues and reproductive structures: (non-vascular, mosses), (vascular, ferns), (woody stems, cones), and (flowering plants).
Invertebrate animal phyla include (no symmetry, pores), (radial symmetry, stinging cells), (bilateral, flat bodies), (segmented worms), (muscular foot, mantle), and (jointed appendages, exoskeleton).
Vertebrate classes are categorized by skin covering and reproductive methods: (bony fish with scales), (moist skin, eggs in water), (dry scaly skin, leathery eggs), (feathers, hard shells), and (hair, milk production).
Taxonomists sometimes reclassify groups (e.g., moving the Figwort family based on evidence) when new evidence suggests a different evolutionary pathway.
📐Formulae
💡Examples
Problem 1:
Classify a Grey Wolf using the full taxonomic hierarchy from Kingdom to Species.
Solution:
Kingdom: ; Phylum: ; Class: ; Order: ; Family: ; Genus: ; Species: .
Explanation:
This follows the Linnaean hierarchy where the binomial name is .
Problem 2:
An unknown plant has vascular tissue, does not produce flowers, but produces seeds in woody cones. Identify the phylum.
Solution:
Explanation:
Plants with vascular tissue ( and ) that reproduce via seeds in cones rather than flowers are classified as .
Problem 3:
Calculate the Simpson's Diversity Index () for a sample where Species A has and Species B has .
Solution:
. . .
Explanation:
The Simpson's Diversity Index is a measure used to quantify the biodiversity of a habitat, where a higher value typically indicates a more stable and diverse ecosystem.