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Saturday, March 17, 2012

article : Classification Organism with three domain - six kingdom Kingdom Classification System

In the post previous articles click here,  classification system into the five kingdom system. Now This divides cellular organisms into:

The Kingdoms of Organisms:

This presentation has taken as standard the "three domain - six kingdom" model of organism diversity, based on 16S ribosomal RNA sequence comparisons, of Carl Woese and co-workers. This divides cellular organisms into:
  • Bacteria (Eubacteria),
  • Archaea (Archaebacteria) and
  • Eukarya (Eukaryotes; further divided into Protista, Plantae, Animalia and Fungi).
GJ Olsen and CR Woese (1993). FASEB Journal 7: 113-123.

However, Robert H Whittaker and Lyn Margulis have suggested that organisms should be divided into five kingdoms: that is,
  • Monera or Procaryotae (prokaryotes, including Bacteria and Archaea)
  • Protista (eukaryotes with single- or colonial cellular organisation, may be photosynthetic)
  • Fungi (generally multinucleate eukaryotes with walled syncytia)
  • Animalia (wall-less eukaryote cells organised into complex organisms)
  • Plantae (generally autotrophic plants, mostly with photosynthetic plastids, simple multicellular to advanced tissue organisation)
This model includes some "plants" as protists, and makes no distinction between Archaea and Bacteria.
RH Whittaker and L Margulis (1978). BioSystems 10: 3-18

To complicate matters, James Lake and co-workers have lately proposed a radical re-structuring of the "universal" phylogenetic tree, to split Archaea into Halobacteria, Methanogens and Eocytes. This would mean there are three major groupings of prokaryotes (Eubacteria + Halobacteria, Methanogens and Eocytes), which could all constitute kingdoms on their own, given each is as unrelated to the others as any are to Eukarya.
JA Lake (1991). Trends in Biochemical Sciences 16: 46-50.

There is also a 2-empire / 8-kingdom scheme, with Archaeobacteria and Eubacteria as kingdoms in Empire Bacteria, and 6 kingdoms in Empire Eukaryota:
  • Archezoa (primitive eukaryotes without chloroplasts or mitochondria)
  • Protozoa (unicellular wall-less eukaryotes with mitochondria)
  • Chromista (photosynthetic organisms with chloroplasts within the lumen of the rough ER; eg: diatoms, brown algae, cryptomonads, oomycetes)
  • Plantae (photosynthetic organisms with chloroplasts within cytoplasm; all land plants, many green algae)
  • Fungi
  • Animalia
Cavalier-Smith T (1993). Microbiological Reviews 57: 953-994

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Article : Classification Organism with Five Kingdom System

Many classification of living things depends on the criteria used. One of the followingclassifications are made based on certain criteria: 

Classification Organism with Five Kingdom Classification System

Once upon a time, all living things were lumped together into two kingdoms, namely plants and animals (at least, that's how I learned it). Animals included every living thing that moved, ate, and grew to a certain size and stopped growing. Plants included every living thing that did not move or eat and that continued to grow throughout life. It became very difficult to group some living things into one or the other, so early in the past century the two kingdoms were expanded into five kingdoms: Protista (the single-celled eukaryotes); Fungi (fungus and related organisms); Plantae (the plants); Animalia (the animals); Monera (the prokaryotes). Many biologists now recognize six distinct kingdoms, dividing Monera into the Eubacteria and Archeobacteria.
All I can say is that the sytem holds true for this week, at least. It might even hold up for a century or two. Accepted systems of classification have changed at a far faster pace than the species have taken to evolve, that's for certain.
Kingdoms are divided into categories called phyla, each phylum is divided into classes, each class into orders, each order into families, each family into genera, and each genus into species. A species represents one type of organism, such as dog, tiger shark, Ameoba proteus (the common amoeba), Homo sapiens (us), or Acer palmatum (Japanese maple). Note that species names should be underlined or written in italics.
Classifying larger organisms into kingdoms is usually easy, but in a microenvironment it can be tricky. If you have had a little biology, a good exercise is to describe individual living things, and to try to classify them as to kingdom.

Monera (includes Eubacteria and Archeobacteria)

Individuals are single-celled, may or may not move, have a cell wall, have no chloroplasts or other organelles, and have no nucleus. Monera are usually very tiny, although one type, namely the blue-green bacteria, look like algae. They are filamentous and quite long, green, but have no visible structure inside the cells. No visible feeding mechanism. They absorb nutrients through the cell wall or produce their own by photosynthesis.


Protists are single-celled and usually move by cilia, flagella, or by amoeboid mechanisms. There is usually no cell wall, although some forms may have a cell wall. They have organelles including a nucleus and may have chloroplasts, so some will be green and others won't be. They are small, although many are big enough to be recognized in a dissecting microscope or even with a magnifying glass. Nutrients are acquired by photosynthesis, ingestion of other organisms, or both.


Fungi are multicellular,with a cell wall, organelles including a nucleus, but no chloroplasts. They have no mechanisms for locomotion. Fungi range in size from microscopic to very large ( such as mushrooms). Nutrients are acquired by absorption. For the most part, fungi acquire nutrients from decaying material.


Plants are multicellular and most don't move, although gametes of some plants move using cilia or flagella. Organelles including nucleus, chloroplasts are present, and cell walls are present. Nutrients are acquired by photosynthesis (they all require sunlight).


Animals are multicellular, and move with the aid of cilia, flagella, or muscular organs based on contractile proteins. They have organelles including a nucleus, but no chloroplasts or cell walls. Animals acquire nutrients by ingestion.

A "mini-key" to the five kingdoms

Suppose you see something in freshwater that certainly appears to be living. How can you begin to determine what it is? Here is a key (not quite perfect) that you might use to help determine the kingdom to which it belongs.
  • 1. Is it green or does it have green parts?
    • Yes - go to 2
    • No - go to 3
  • 2. Could be a plant or a protist, or blue-green bacteria. Make sure that the green is really part of the organism, though. An animal might have eaten something green, for example.
    • Single-celled? go to 6
    • Multicellular? Plantae. Look for cell walls, internal structure. In the compound microscope you might be able to see chloroplasts.
  • 3. Could be a moneran (bacteria), protist, fungus, or animal.
    • Single-celled - go to 4
    • Multicellular (Look for complex or branching structure, appendages) - go to 5
  • 4. Could be a moneran or a protist. Can you see any detail inside the cell?
    • Yes - Protista. You should be able to see at least a nucleus and/or contractile vacuole, and a definite shape. Movement should be present, using cilia, flagella, or amoeboid motion. Cilia or flagella may be difficult to see.
    • No - Monera. Should be quite small. May be shaped like short dashes (rods), small dots (cocci), or curved or spiral shaped. The largest them that is commonly found in freshwater is called Spirillum volutans. It is spiral shaped, and can be nearly a millimeter long. Except for Spirillum, it is very difficult to see Monerans except in a compound microscope with special lighting.
  • 5. Animalia or Fungi. Is it moving?
    • Yes - Animalia. Movement can be by cilia, flagella, or complex, involving parts that contract. Structure should be complex. Feeding activity may be obvious.
    • No - Fungus. Should be branched, colorless filaments. May have some kind of fruiting body (mushrooms are a fungus, don't forget). Usually attached to some piece of decaying matter - may form a fuzzy coating on or around an object. In water, some bacterial infections of fish and other animals may be mistaken for a fungus.
  • 6. Most likely Protista. If it consists of long, unbranched greenish filaments with no apparent structure inside, it is blue-green bacteria (sometimes mistakenly called blue-green algae), a Moneran.
Most green protists are flagellates, that is, they move rapidly with a spiralling motion. Unless you get them to stop, you can't really see the flagella. Watch out for colonial protists, though, such as Volvox, which forms a spinning ball of green cells. Don't be fooled into thinking it is a plant.
Remember, the more you observe the organism, the more sure you can be. Many living things have stages that make them resemble members of another kingdom.

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