Transcript
CLASSIFICATION
CLASSIFICATION
•Definition of classification•Importance of classification•Hierarchy of classification•Evolution of classification•General plant classification
What is Classification?
Classification is the process of arranging organisms into groups based on similarities.
It is the arrangement of entities in a hierarchical series of nested classes, in which similar or related classes at one hierarchical level are combined comprehensively into more inclusive classes at the next higher level.
IMPORTANCE OF CLASSIFICATION OF ORGANISMS
IMPORTANCE OF CLASSIFICATION OF ORGANISMS
1. It makes the study of such a wide variety of organisms easy.
IMPORTANCE OF CLASSIFICATION OF ORGANISMS
2. It projects before us a good picture of all life forms at a glance.
IMPORTANCE OF CLASSIFICATION OF ORGANISMS
3. It helps us understand the interrelationship among different groups of organisms.
IMPORTANCE OF CLASSIFICATION OF ORGANISMS
4. It serves as a base for the development of other biological sciences such as biogeography etc.
IMPORTANCE OF CLASSIFICATION OF ORGANISMS
5. Various fields of applied biology such as agriculture, public health and environmental biology depend on classification of pests, disease vectors, pathogens and components of an ecosystem.
HIERARCHY OF CLASSIFICATION
HIERARCHY OF CLASSIFICATIONDOMAIN
KINGDOM
CLASS
DIVISION
TRIBE
GENUS
ORDER
FAMILY
SUBCLASS
SUPER ORDER SUBFAMILY
SUBTRIBE
VARIETY
FORM
CULTIVAR
SPECIES
Domain
It is the highest taxonomic rank of organisms, higher than a kingdom. According to the three-domain system of Carl Woese, introduced in 1990, the Tree of Life consists of three domains: Archaea, Bacteria and Eukarya.
The arrangement of taxa reflects the fundamental differences in the genomes.
Kingdom
It is a taxonomic rank, which is either the highest rank or in the more recent three-domain system, the rank below domain.
Division
It is a term used for animals while its synonym division is used for plants. It is collection of similar classes.
Class
One or more than one order makes a class. It can be:
Angiospermae (Angiosperms) - Plants which produce flowers.
Gymnospermae (Gymnosperms) - Plants which don't produce flowers
Subclass
Subclass is either:Dicotyledonae (Dicotyledons, Dicots) - Plants with
two seed leaves
Monocotyledonae (Monocotyledons, Monocots) - Plants with one seed leaf
SUPERORDER
A group of related Plant Families, classified in the order in which they are thought to have developed their differences from a common ancestor.
The names of the Superorders end in -idae
ORDER
Each Superorder is further divided into several Orders.
The names of the Orders end in -ales
FAMILY
Is a group of closely related genera.Modern botanical classification assigns a type
plant to each Family, which has the particular characteristics which separate this group of plants from others, and names the Family after this plant.
The names of the Families end in -aceae
SUBFAMILY
The Family may be further divided into a number of sub-families, which group together plants within the Family that have some significant botanical differences.
The names of the Subfamilies end in -oideae
TRIBE
A further division of plants within a Family, based on smaller botanical differences, but still usually comprising many different plants.
The names of the Tribes end in -eae
SUBTRIBE
A further division, based on even smaller botanical differences, often only recognizable to botanists.
The names of the Sub tribes end in -inae
GENUS
It is a collection of closely related species.
the usual major subdivision of a family or subfamily in the classification of organisms, usually consisting of more than one species.
The name of the Genus should be written with a capital letter.
SPECIES
This is the level that defines an individual plant. Often, the name will describe some aspect of the plant - the colour of the flowers, size or shape of the leaves, or it may be named after the place where it was found.
The name of the species should be written after the Genus name, in small letters, with no capital letter.
VARIETY
A Variety is a plant that is only slightly different from the species plant, but the differences are not as insignificant as the differences in a form. The Latin is varietas, which is usually abbreviated to var.
The name follows the Genus and species name, with var. before the individual variety name.
FORM
A form is a plant within a species that has minor botanical differences, such as the colour of flower or shape of the leaves.
The name follows the Genus and species name, with form (or f.) before the individual variety name.
CULTIVAR
A Cultivar is a cultivated variety, a particular plant that has arisen either naturally or through deliberate hybridisation, and can be reproduced (vegetatively or by seed) to produce more of the same plant.
The name follows the Genus and species name. It is written in the language of the person who described it, and should not be translated. It is either written in single quotation marks or has cv. written in front of the name.
Example of Plant scientific ClassificationCategory Scientific Name Common Name
KINGDOM Plantae Plant
DIVISION Magnoliophyta Magnolia
CLASS Angiospermae Angiosperms
SUBCLASS Dicotyledonae Dicotyledons
SUPERORDER Magnoliidae Magnolia Superorder
ORDER Ranunculares Buttercup Order
FAMILY Ranunculaceae Buttercup Family
SUBFAMILY Ranunculoideae Buttercup Subfamily
TRIBE Ranunculeae Buttercup Tribe
GENUS Ranunculus Buttercup
SPECIES (Ranunculus) flammula Lesser Spearwort
SUBSPECIES (Ranunculus flammula) subsp. flammula Lesser Spearwort
VARIETY (Ranunculus flammula subsp. flammula) var. tenuifolius Narrow-leaved Lesser Spearwort
EVOLUTION OF CLASSIFICATION
1. Two kingdoms
• The classification of living things are animals and plants in ancient times.
• Aristotle (384–322 BC) classified animal species in his work The History of Animals, and his pupil Theophrastus (c. 371–c. 287 BC) wrote a parallel work on plants (Historia Plantarum (The History of Plants)).
1. Two kingdoms
Life
Regnum Vegetabile
Regnum Animale
2. Three kingdoms
Life
Kingdom Protista
Kingdom Plantae
Kingdom Animalia
3. Four Kingdoms
Life
Kingdom Monera
Kingdom Protista
Kingdom Animalia
Kingdom Plantae
3. Four Kingdoms
Life
Kingdom Animalia Kingdom Plantae Kingdom Protista
Empire Prokaryota Empire Eukaryota
Kingdom Monera
4. Five Kingdoms
Life
Empire Prokaryota Empire Eukaryota
Kingdom Monera Kingdom Protista Kingdom Plantae
Kingdom Animalia Kingdom Fungi
5. Six Kingdoms
Life
Domain Bacteria Domain Archaea
Domain Eukarya
Kingdom Protista Kingdom Plantae
Kingdom Animalia Kingdom Fungi
Kingdom Bacteria Kingdom Archaea
General Plant Classification
General Plant Classification
A. Non-vascular PlantsB. Vascular Plants
a. with seedsb. without seeds
Non-vascular Plants
the simplest of all land dwelling plants
Do not produce seeds or flowers.
Divisions in Non-Vascular Plants
1. Division Bryophyta• the first true plants, evolving from charophytes almost 500 million years ago.•Includes • mosses (Class musci), •liverworts (Class Hepaticae) •hornworts (Class Anthocerotae).
Division Bryophyta
leafy liverwort picture of a hornwort
Mosses
• 2. Division Rhodophyta/ Red Algae
•typically tropical and come in saltwater forms. •contain chlorophyll as well as other accessory pigments, such as phycoerythrin, phycocyanin, and phycobilin.
Division Rhodophyta
Ptilota filicina, Smithora naiadum, and Botryoglossum ruprechtianum
3. Division Phaeophyta / Brown Algae• 99% of this species are found in the marine
environment; they basically only exist in saltwater forms.
• The thallus or the body of the brown kelp algae is made of:–Holdfast–Stipe –Pneumatocyst –Blade
Division Phaeophyta
4. Division Chlorophyta / Green Algae•Several species of this are symbiotic and form linchens with fungi or live with corals.
Division Chlorophyta
Caulerpa taxifolia Acetablaria ryukyuensis
General Plant Classification
2. Vascular Plants - Vascular plants (also known as tracheophytes or higher plants) are those plants that have lignified tissues for conducting water, minerals, and photosynthetic products through the plant.Divided into:
a. Seedless Plantsb. Seed Plants
Divisions in Vascular Plants (seedless plants)
1. Division Pterophyta (ferns)The Pterophyta includes the ferns. Ferns
represent the second major step in the evolutionary sophistication of plants. The division Pterophyta is a group of non-seed plants with a fossil record dating back to the lower Devonian. The division consists of about 11,000 living species.
Division Pterophyta (ferns)
Divisions in Vascular Plants (seedless plants)
2. Division Lycophyta (club mosses) These plants are commonly known as the
lower ferns and possess true vascularized stems, leaves and roots. The position and microanatomy of the vascular tissue is characteristic of these forms. The most significant feature of lycophytes are microphylls.
Division Lycophyta (club mosses)
Divisions in Vascular Plants (seedless plants)
3. Division Psilophyta (whiskfern) They have been considered “primitive,”
recent developmental and molecular evidence suggests that the group may actually be reduced from fern-like ancestors. Despite the uncertainty of their relationships, psilophytes do structurally resemble certain early vascular plants, and are used as a model for understanding the ecology of these plants.
Division Psilophyta (whiskfern)
Divisions in Vascular Plants (seedless plants)
4. Division Sphenophyta (horsetails)The Order is divided into two common
groups known as the "horsetails" and "scouring rushes". The horsetails have jointed hollow and narrow stems with much reduced leaves and side branches are lacking. The scouring rushes have rough-ridges stems with side branches that are long and narrow.
Division Sphenophyta (horsetails)
Divisions in Vascular Plants (seed plants)
1. Division Anthophyta (angiosperms, flowering plants)
Division Anthophyta, the angiosperms, or flowering plants, contains 99.5% of all extant plant species, as well as 80% of all living plants. First appearing in the Cretaceous period, angiosperms contain several key adaptations that allowed them to become dominant in the plant world. First of all, angiosperms typically have broad, flat leaves, which allows for a more efficient collection of solar energy and a better rate of photosynthesis
Division Anthophyta (angiosperms, flowering plants)
Divisions in Vascular Plants (seed plants)
2. Division Coniferophyta (the gymnosperms, evergreen trees)
Conifers are generally large trees and include pines, spruce, firs, cedars, redwoods, junipers, larches, cypresses, and yews. Most conifers are evergreens and so they keep their leaves year-round. The leaves are needle-shaped and have a thick cuticle for protection and to decrease water loss. Conifers are so named because of the reproductive cones they produce. Division Coniferophyta comprises the conifers, the most abundant gymnosperms today
Division Coniferophyta (the gymnosperms, evergreen trees)
Divisions in Vascular Plants (seed plants)
3. Division CycadophytaCycads are an ancient group of seed plants
which are characterized by a large crown of compound leaves and a stout trunk. They are evergreen, gymnospermous, dioecious plants having large pinnately compound leaves and belong to the division Cycadophyta.
Division Cycadophyta
Divisions in Vascular Plants (seed plants)
4. Division GnetophytaThis group has three orders Ephedrales,
Gnetales, and Welwitschiales, each with one living genus, Ephedra, Gnetum, and Welwitschia, respectively. Although they are allied with the gymnosperms, members of these orders have very little in common with one another or with other gymnosperm groups. Plants of this division have primitive vessels in the secondary xylem.
Division Gnetophyta
Divisions in Vascular Plants (seed plants)
5. Division Ginkgophyta Division Ginkgophyta, the ginkgoes, lived
on earth millions of years ago. Its vegetative characteristics are deciduous trees bearing distinctive fan-shaped leaves. Branches with numerous spur shoots that bear the reproductive structures. Stems with extensive secondary growth producing considerable secondary xylem
Division Ginkgophyta
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