Section 1: Nature and Variety of Living Organisms

Biology Revision

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B) Variety of Living Organisms

PLANT

ANIMALS

FUNGI

PROCTOCTISTA

BACTERIA

VIRUSES

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B) Variety of Living Organisms (

PLANTS

  • Autrophic- own food / self feed
  • Multicelluar
  • Cellulose cell wall
  • Chlorophyll in chloroplasts for photosynthesis
  • Carbohydrate is stored as starch or sucrose

ANIMALS

  • Multicelluar
  • No cell walls and no chlorophyll - so no p/s
  • Heterotrophic- other feeding
  • Carbohydrate store is Glycogen
  • Nervous system
  • Locomotion

FUNGI

  • Heterotrophic
  • Chitin cell wall
  • Single celled e.g. yeast / made out of hypae interwcave to make mycellum e.g. moulds
  • Glycogen is carbohydrate store
  • Pathogenic - causes diseases (e.g. atheltes food, the fungus causes the irish potatoe famine

PROCTOCTISTA

  • Single celled- all life process happen
  • Microscopic and have animal and plant characteristics
  • Pathogenic (E.g. Plasmodium which causes malaria when transmitted by mosquitoes)

BACTERIA

  • Microscopic
  • Reproduce by Binary Fission
  • Useful and harmful
  • Pathogenic
  • Autrophic and Photosynethsis- bacteria chlorophyll
  • Saprotrophic

VIRUSES

  • Sub Microscopic- need electron microscope to see them
  • parasitic- get into a living cell
  • Only reproduce
  • Infect all types of living things e.g. plants,animals, bacteria and dinosaurs
  • Genetic material is DNA in some and RNA in others. E.g. RNA is HIV and DNA is flu
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