IB outcomes: 

Explain the concept and importance of biodiversity in tropical rainforests. Examine the causes and consequences of reduced biodiversity in this biome.


Part 1: Intro to Biodiversity

World Ecosystems


  • The sun supplies the overwhelming majority of energy
    • The energy is absorbed by plants through photosynthesis
    • It is then redistributed to other species through
      • Decomposition
      • Combustion
      • Consumption
  • The biosphere is the part of the earth where all living thing live.
  • All elements are directly or indirectly interdependent.
  • An ecosystem is an interdependent community of plants and animals together with the habitat to which they have adapted.
  • Organisms can be either producers or consumers:
    • Producers convert energy from the environment into carbon bonds
    • Plants are the most obvious examples of producers; plants take energy from sunlight and use it to convert carbon dioxide into glucose (or other sugars).
    • Another word for producers is autotrophs
    • Energy and nutrients are passed from organism to organism through the food chain as one organism eats another.
    • Decomposers remove the last energy from the remains of organisms.
    • Inorganic nutrients are cycled, energy is not.
  • Biodiversity is the biological diversity of all forms of life on earth: plants, animals and microorganisms. It refers to to species diversity, variations within species, interdependence of species, and habitat diversity.


Exercise: In groups, you will explain one of the following model. Create a (max) one page factsheet to share with the class

  1. Trophic levels
  2. Energy flows within an ecosystem
  3. Pyramid of numbers, biomass and energy
  4. The importance of tropical ecosystems – See also and this

Include a vocabulary and definition list, useful website list and images

We will present 20 minutes before the end of class, or when you are all done.