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Science

Classification

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We can understand the evolutionary and ecological relationships between organisms if we can classify them.

Kingdoms

Organisms can be classified into groups according to characteristics that they share. The first big division of living things in the classification system is to put them into one of five kingdoms. These are based on what an organism's cells are like. The table shows the names of the kingdoms and examples of the sort of organisms they contain.

Kingdoms and organisms

kingdomcharacteristicsexamples
Animals
Animalia- goat

Cells do not have a cell wall. Multicellular and feed on other organisms.All multicellular animals, including: jellyfish, worms, arthropods, molluscs, echinoderms, fish, amphibia, reptiles, birds and mammals
Plants

Cells have a cellulose cell wall. They use light energy to produce food by photosynthesis.All green plants, including: algae, ferns and mosses (plants that do not produce seeds); conifers and flowering plants (plants that do produce seeds)
Fungi

Cells have chitin cell walls. Reproduce using spores rather than seeds.Moulds, mushrooms, yeast
Prokaryotes

Have a cell wall but not made from cellulose. Cells have no nucleus.Bacteria, blue-green algae
Protoctists
An ameoba, a simple unicellular organism

An ameoba, a simple unicellular organism

Exist as single cells or colonies of single cells.Amoeba, Paramecium

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