Patterns in Life: Diversity and Classification

Comprehensive vocabulary flashcards covering biodiversity, taxonomic hierarchy, binomial nomenclature, and the historical development of biological classification systems from Aristotle to Carl Woese.

Biodiversity

The immense variety of living organisms on Earth, ranging from microscopic forms to giant trees and animals, occupying diverse habitats such as mountains, forests, deserts, and oceans.

Major Biodiversity Hotspots of India

The Western Ghats, the Himalayas, the Indo-Burma region (including North-East India), and the Sundaland region (including the Nicobar Islands).

Neelakurinji

An endemic plant species in India that blooms once every 12 years in the hills of Kerala and Tamil Nadu.

Endemic Species

Species restricted to a particular region and not naturally found elsewhere; examples in India include the Nilgiri tahr, Lion-tailed macaque, Nepenthes khasiana (pitcher plant), and Neelakurinji.

Biodiversity Hotspot

A region characterised by high species diversity, especially a high concentration of endemic species, that has experienced significant habitat loss.

Biological Classification

The scientific system of arranging living organisms into groups and subgroups based on shared similarities, differences, and evolutionary relationships.

Great Hornbill

A hornbill species found in Arunachal Pradesh's Pakke Tiger Reserve characterised by very large size, a huge yellow casque, and a black body.

Rufous-necked Hornbill

A hornbill species recorded in the Pakke Tiger Reserve characterised by medium size, a rufous-coloured neck, and a small casque.

Hierarchy (in Classification)

A system of biological classification into which taxonomic categories are arranged in descending order of dissimilarities among organisms.

Taxonomic Category

A rank used in biological classification arranging organisms into a hierarchy of Kingdom, Phylum (for animals) or Division (for plants), Class, Order, Family, Genus, and Species.

Species

The smallest taxonomic category and the basic, most specific unit of classification, consisting of similar organisms that can interbreed.

Genus

A taxonomic category consisting of a group of closely related species, such as Panthera (big cats) or Pisum (peas).

Family (Taxonomy)

A taxonomic rank comprising groups of closely related genera, such as Felidae (cat family) or Fabaceae (pea or legume family).

Order (Taxonomy)

A taxonomic category grouping families that share similar features and structure, such as Carnivora (flesh-eating animals) or Fabales (pea and related plants).

Class (Taxonomy)

A taxonomic rank that groups orders with more similar characteristics, such as Mammalia (mammals) or Dicotyledonae (dicot plants).

Phylum / Division

A broad taxonomic rank grouping classes with a similar basic body plan, designated as Phylum for animals (e.g., Chordata) and Division for plants (e.g., Angiospermae).

Kingdom

The broadest taxonomic level in biological classification, which includes many related phyla or divisions (e.g., Animalia or Plantae).

Binomial Nomenclature

A naming system proposed by Carolus Linnaeus wherein an organism is given a two-word Latin or Latinised name; the generic name begins with a capital letter and the species name with a small letter, printed in italics or underlined separately.

Artificial System of Classification

An early classification system proposed by Aristotle in the 4th Century BCE that grouped animals based solely on visible external features and their habitat (land, water, and air).

Rigveda and Brihat Samhita (Classification)

Ancient Indian texts that classified living organisms based on their habitat, behaviour, and ecological roles.

Two Kingdom Classification

A classification scheme introduced by Carolus Linnaeus in 1758 dividing living organisms into Plantae (autotrophic, non-motile) and Animalia (heterotrophic, motile).

Three Kingdom Classification

A system proposed by Ernst Haeckel in 1866 that introduced the kingdom Protista to accommodate microscopic unicellular organisms such as Amoeba, Paramecium, Chlamydomonas, and Euglena.

Four Kingdom Classification

A system developed by Herbert F. Copeland in 1938 that introduced the kingdom Monera for organisms lacking a true nucleus (e.g., Bacteria, Archaebacteria, Cyanobacteria), resulting in Monera, Protista, Plantae, and Animalia.

Five Kingdom Classification

A classification system proposed by Robert H. Whittaker in 1969 that separated Fungi into their own kingdom due to their heterotrophic absorptive nutrition, establishing Monera, Protista, Fungi, Plantae, and Animalia.

Three-Domain Classification System

A phylogenetic classification system proposed by Carl Woese in 1977 based on genetic similarities and DNA evolutionary relationships, dividing life into Bacteria, Archaea, and Eukarya.

Domain Bacteria

In Carl Woese's three-domain system, a group of single-celled prokaryotes possessing cell walls containing peptidoglycan.

Domain Archaea

In Carl Woese's three-domain system, a group of single-celled prokaryotes lacking peptidoglycan in their cell walls, many of which inhabit extreme environments.

Domain Eukarya

In Carl Woese's three-domain system, organisms composed of eukaryotic cells containing a true nucleus, including protists, fungi, plants, and animals.