Heterotrophic nutrition

• What are the 4 types of heterotrophic nutrition?

  -holozoic

  -saprotrophic

  -parasitic

  -mutualistic
• What is heterotrophic nutrition?

  When organisms obtain complex organic molecules from other organisms
• What is saprotrophic nutrition?

  -external digestion

  -involves enzymes

  • enzymes are secreted at the ends of hyphae (exocytosis) onto food
  • digestion occurs
  • small soluble substances are absorbed by facilitated diffusion/active transport
• What are some examples of organisms that feed by saprotrophic nutrition?

  Fungi, bacteria

  They 'feed on' dead/decaying material
• What is a saprophyte?

  An organism that secretes enzymes onto its food outside the body (extracellular digestion). They absorb soluble products by diffusion