4.7.2.1 levels of organisation

• what are the producers of biomass on Earth?

  photosynthetic organisms
• how can feeding relationships within a community can be represented?

  food chains
• what do all food chains start with?

  a producer
• what is a producer?

  plants and algae - produce most of the biomass for life on earth as they synthesize molecules - eg. glucose
• what are the animals that eat the producers called?

  primary consumers
• what are the animals that eat the primary consumers called?

  secondary consumers
• what are predators?

  consumers that kill and eat other animals
• what is prey?

  those that are eaten
• what happens to the number of predators and prey in a stable community?

  they rise and fall in cycles
• what are transects and quadrats used for?

  used by ecologists to determine the distribution and abundance of species in an ecosystem