3.1 Living organisms and cells

  • Created by: 14mut64
  • Created on: 11-05-19 19:57

Plants

PLANTS

  • multi-cellular organisms
  • cells contain chloroplasts so that they are able to carry out photosynthesis
  • have cell walls made of cellulose
  • store carbohydrates as starch or sucrose
  • e.g. elodea
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Animals

ANIMALS

  • are multi-cellular organisms
  • cells do not contain chloroplasts, so they do no photosynthesize
  • no cell walls
  • normally have nervous co-ordination and are able to move from one place to another
  • store carbohydrates as glycogen
  • e.g. lions, grasshopper
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Fungi

FUNGI

  • unable to photosynthesize
  • bodies are normally organised into mycelium - mycelium are made of thread-like structures called hyphae, which have many nuclei
  • cell walls are made of chitin
  • they feed by extra-cellular secretion of digestive enzymes into their surroundings, and absorb the organic products - this is known as saprotrophic nutrition
  • store carbohydrate as glycogen
  • some are single-celled e.g. yeast
  • some are multi-cellular e.g. mucor
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Protoctists

PROTOCTISTS

  • microscopic single-celled organisms
  • e.g. amoeba - have features of an animal cell, and live in pond water
  • e.g. chlorella - have chloroplasts and are more like plants
  • pathogenic e.g. plasmodium, which causes malaria
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