Biological classification

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Glossary:

1 Taxonomy

2 Prokaryotic cells

3. Eukaryotic cells

4. Classification

5. Monera

6. Protista

7. Fungi

8. Plantae

9. Animalia

10. Autotrophic

11. Heterotrophic

Children’s material

General information:

1 Taxonomy is the branch of biology involved in naming and classifying the various organisms.

2 It is based on the differences between prokaryotic and eukaryotic cells.

Prokaryotic cells have no distinct nucleus or nuclear membrane and no organelles ;representative organisms are bacteria and cyanobacteria (bluegreen algae).

Eukaryotic cells have a distinct nucleus and nuclear membrane and numerous organelles; representative organisms are all those other than bacteria and cyanobacteria.

3 Classification is based on similarities in structure,

function,chemistry,behavior, habitat, reproduction, and development.

Classification of Kingdoms

1 Five kingdoms of organisms are currently recognized: Monera, Protista,

Fungi, Plantae, and Animalia.

2 This classification scheme was proposed by Robert H. Whittaker, an

American biologist, in 1959.

Kingdom Monera

1 This kingdom comprises prokaryotic, single-cell organisms.

2 Bacteria and cyanobacteria (blue-green algae) are members of this kingdom.

Bacteria are autotrophic and heterotrophic

Cyanobacteria are photosynthetic and fix nitrogen.

Kingdom Protista

1 This kingdom encompasses a diverse group of eukariotic, unicellular, colonial, or filamentousorganisms that mat or may not have cell walls.

2 Protists are generally small and inconspicuous; they may photosynthetic, heterotrophic, or both.

3 Examples include algae and protozoa, such as amoeba, diatoms, seaweed, slime molds, and ciliates.

Kingdom Fungi

1 The Kingdom Fungi consists of eukaryotic, filamentous organisms with chitin in cell wall.

2 These heterotrophic organisms absorb nutrients from their surroundings.

3 Mushrooms, mildew, yeast, and molds are fungi.

Kingdom Plantae

1 Multicellular euraryotic, autotrophic, and photosyntetic organisms make up the Kingdom Plantae.

2 All plants contain chlorophyll and most live on land.

Bryophytes are nonvascular, seedless plants; examples are mosses, liverworts, and theirrelatives.

Tracheophytes have vascular tissue for transporting water and nutrients; ezamples include seedless plants and seed plants. a) Seedless vascular plants, which reproduce by spores, include ferns and their relatives. b) Seed plants include conifers and evergreens (gymnosperms) andflowering plants (angiosperms).

Kingdom Animalia

1 Thiskingdom consists of euraryotic, heterotrophic, multicellular organisms.

2 The major phyla of the animal kingdom are:

Porifera (sponges)

Cnidaria (jelly-fishes, corals, and sea anemones)

Platyhelminthes (flatworms, flukes, and tapeworms)

Nemertina or Aschelminthes (roundworms)

Annelida (segmented worms, leeches, and earthworms)

Arthropoda (animals with jointed appendages and segmented bodies, such as insects, crayfish, spiders, centipedes, horseshoe crabs, and barnacles)

Echinodermata (starfish, sea urchins, and sand dollars)

Chordata (animals with a spinal cord, such as fish, amphibians, reptiles, birds, and mammals)

Bacteria (Monera) 2. Protista 3. Fungi 4. Plants 5. Animals

Five Kingdoms

Kingdom Cell type Organization Nutrition

Monera Prokaryotic Unicellular-small

Absorb,

Photsyn.,

Chemosyn.

Protista Eukaryotic

Unicellular or colonial

Fungi Eukaryotic Multicellular

Ingest,

Photosyn.

Absorb

Organisms

Bacteria,

Cyanobacteria

Protozoa,

Algae

Fungi, yeast,

Plantae Eukaryotic Multicellular

Animalia Eukaryotic Multicellular

Photosyn.

Ingest.

molds

Plants

Animals

The next level of the family tree under each of these kingdoms is called " Phyla ". The plural of phylum is phyla.The animal (animalia) kingdom for example is divided into approximately 38 smaller phyla branches of the tree. The next levels down the tree are " Class ",

Subclass ", " Order ", " Suborder ", " Family ", " Genus ", and " Species "

Taxonomy

Carolus Linnaeus

Taxonomy - study of classifying organisms

Taxonomists are scientists who study classifying

Taxon is a category into which related organisms are placed

Reasons to Classify:

Shows evolutionary relationships

Accurately & uniformly names organisms

Prevents misnomers such as starfish & jellyfish that aren't really fish

Uses same language ( Latin ) for all names

Prevents duplicated names because all names must be approved by

International Naming Congresses

Naming rules are followed called the International Code for

Binomial Nomenclature

Early Taxonomy:

Aristotle was the first taxonomist dividing organisms into land, sea, & air dwellers

John Ray was the first to use Latin for naming

Linnaeus developed the modern system of naming known as binomial nomenclature, a two-word name (Genus & species)

Scientific names should be italicized in print or underlined when writing

Always capitalize the genus name

The scientific name for man is Homo sapiens

The genus name may be abbreviated , but not the species (H.

sapiens)

Modern Taxonomic System:

Modern taxonomy uses six kingdoms --- Archaebacteria,

Eubacteria, Protista, Fungi, Plantae, & Animalia

Archaebacteria & Eubacteria are unicellular prokaryotes lacking a nucleus, while Protista, Fungi, Plantae, & Animalia are all eukaryotes with a nucleus & membrane-bound organelles

All members of Plantae & Animalia are multicellular organisms

Fungi & Animalia are heterotrophs, while Plantae are all autotrophs capable of making their own food

Archaebacteria live in harsh environments like very salty lakes; intestines of mammals; and hot, sulfur springs & may be autotrophs or heterotrophs

Eubacteria are true bacteria some of which cause disease

Protista are mainly unicellular with a few multicellular organisms and may be autotrophic (Euglena) or heterotrophic (Ameba)

Fungi include multicellular mushrooms, mold, unicellular yeast, etc.

& are absorptive heterotrophs (digest food & then absorb it)

Animalia are ingestive heterotrophs that take in food & then digest it inside their multicellular bodies.

Plantae includes all plants & are the only all multicellular, autotrophic kingdom

Here are some definitions:

 Classification is a very broad term which simply means putting things in classes. Any kind of organisational scheme is a classification: for example, sorting smarties by colour, coins by diameter or cities by population.

Humans seem unable to resist the urge to classify. It's one of the most basic activities of any science, because it's easier to think about a few groups of things than about lots of separate things.

 Taxonomy means giving names to things. It tends to go hand in hand with classification, but need not. You can arrange things without naming them, or name them without arranging them, but the most helpful schemes name

 things in a way the reflects their classification.

 Systematics is the process of trying to classify animals (or plants) according to their phylogeny. We could describe the systematics of a group at any moment as being the best current approximation to its phylogeny - because the phylogeny is a solid, unchanging thing, but our systematics will change as we discover more information. (For example, the Therizinosauria were widely considered to be related to the prosauropods until the discovery of the basal therizinosaur Beipiaosaurus showed that they were coelurosaurs.)

Biological classification

"Scientific classification"

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