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IB Biology Topic 5.5 - Classification

IB Biology Topic 5.5 - Classification. Topics:. 5.5.1 Outline the binomial system of nomenclature 5.5.2 List seven levels in the hierarchy of taxa using an example from two different kingdoms for each level.

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IB Biology Topic 5.5 - Classification

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  1. IB Biology Topic 5.5 - Classification

  2. Topics: • 5.5.1 Outline the binomial system of nomenclature • 5.5.2 List seven levels in the hierarchy of taxa using an example from two different kingdoms for each level. • 5.5.3 Distinguish between the following phyla of plants, using simple external recognition features: bryophyta, filicinophyta, coniferophyta and angiospermophyta. • 5.5.4 Distinguish between the following phyla of animals, using simple external recognition features: porifera, cnidaria, platyhelminthes, annelida, mollusca and arthropoda. • 5.5.5 Apply and design a key for a group of up to eight organisms.

  3. 5.5.1 Outline the binomial system of nomenclature • Species are a group of organisms with similar characteristics which can interbreed and produce fertile offspring whereas a genus is a group of similar species. • Species need an international name and so biologists name them using the binomial system of nomenclature.

  4. Each species is given two names. The first is the genus name and is given an upper case first letter. • I.E. Homo • The second is the species name and is given a lower case first letter. • I.E. sapiens • Homo sapien is the correct binomial nomenclature for humans.

  5. 5.5.2 List seven levels in the hierarchy of taxa using an example from two different kingdoms for each level. • Red Kangaroo:Kingdom: AnimaliaPhylum: ChordataClass: MammaliaOrder: DiprotodontiaFamily: MacropodidaeGenus: MacropusSpecies:rufus

  6. White Oak tree:Kingdom: PlantaePhylum: MagnoliophytaClass: MagnoliopsidaOrder: FagalesFamily: FagaceaeGenus: QuercusSpecies: alba

  7. 5.5.3

  8. 5.5.4 • Porifera: • no clear symmetry • attached to a surface • pores through body • no mouth or anus • example: sponges • Cnidaria: • radially symmetric • tentacles • stinging cells • mouth but no anus • example: jellyfish

  9. Platyhelminths:  • bilaterally symmetrical • flat bodies • unsegmented • mouth but no anus • example: tapeworm • Annelida: • bilaterally symmetrical • bristles often present • segmented • mouth and anus • example: earthworm

  10. Mollusca: • muscular foot and mantle • shell may be present • segmentation not visible • mouth and anus • example: slugs and snails • Arthropoda: • bilaterally symmetric • exoskeleton • segmented • jointed appendages • example: spiders and insects

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