Food chains

• What do food chains show?

  • Feeding relationships
• What are the levels of a food chain?

  • Producer: Photosynthetic organism that synthesise molecules (plants/algae)
  • Primary consumer: Organism that eats the producer
  • Secondary consumer: Organism that eats the primary consumer
  • Tertiary consumer: Organism that eats the secondary consumer
  • Producers make glucose which is used to make other molecules that make up biomass
• How can you work out the distribution and abundance of species in an ecosystem?

  • Using transects and quadrats then calculating the mean, median and mode and drawing a graph
• • A stable community will show population cycles between predators and prey.
  • If the population of prey increases, the population of predators will also increase.
  • When there isn't enough prey to feed predators, the number of prey falls and the number of predators increase