CIE IGCSE Biology: 复习笔记:1.1.4 Features of Organisms

CIE IGCSE Biology: 复习笔记:1.1.4 Features of Organisms

The Five Kingdoms

  • The first division of living things in the classification system is to put them into one of five kingdoms. They are:
    • Animals
    • Plants
    • Fungi
    • Protoctists
    • Prokaryotes

 

  • Main features of all animals:
    • they are multicellular
    • their cells contain a nucleus but no cell walls or chloroplasts
    • they feed on organic substances made by other living things

A typical animal cell

  • Main features of all plants:
    • they are multicellular
    • their cells contain a nucleus, chloroplasts and cellulose cell walls
    • they all feed by photosynthesis

A typical plant cell

The Animal Kingdom

  • Several main features are used to place organisms into groups within the animal kingdom

Vertebrates

  • All vertebrates have a backbone
    • There are 5 classes of vertebrates

Vertebrate Table

Vertebrate classification

Invertebrates

  • Invertebrates do not possess a backbone
  • One of the morphological characteristics used to classify invertebrates is whether they have legs or not
  • All invertebrates with jointed legs are part of the phylum Arthropods
  • They are classified further into the following classes:

Invertebrate Table

Arthropod classification

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