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HSC Biology

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  1. Module 1: Cells as the Basis of Life
    Cell Structure
  2. Cell Function
    4 Topics
  3. Module 2: Organisation of Living Things
    Organisation of Cells
    2 Topics
  4. Nutrient and Gas Requirements
    6 Topics
  5. Transport
    2 Topics
  6. Module 3: Biological Diversity
    Effects of the Environment on Organisms
    2 Topics
  7. Adaptations
  8. Theory of Evolution by Natural Selection
  9. Evolution - the Evidence
  10. Module 4: Ecosystem Dynamics
    Population Dynamics
  11. Past Ecosystems
  12. Future Ecosystems
  13. Module 5: Heredity
    Reproduction
  14. Cell Replication
  15. DNA and Polypeptide Synthesis
  16. Genetic Variation
  17. Inheritance Patterns in a Population
  18. Module 6: Genetic Change
    Mutation
    1 Topic
  19. Biotechnology
  20. Genetic Technologies
  21. Module 7: Infectious Disease
    Causes of Infectious Disease
  22. Responses to Pathogens
  23. Immunity
  24. Prevention, Treatment and Control
  25. Module 8: Non-infectious Disease and Disorders
    Homeostasis
  26. Causes and Effects
  27. Epidemiology
  28. Prevention
  29. Technologies and Disorders
HSC Biology Nutrient and Gas Requirements Autotrophs vs Heterotrophs
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Lesson 4, Topic 1
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Autotrophs vs Heterotrophs

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Autotrophs can produce their own organic compounds from inorganic compounds surrounding them whereas heterotrophs must consume other organisms for organic substances for energy.

AutotrophHeterotroph
Can produce its own food using photosynthesis; producer.Cannot make its own food, therefore derives its food from other sources; consumer.

Nutrient and Gas Requirements

Nutrient/Gas RequirementAutotrophHeterotroph
Oxygen gasDiffuses into plant across the cell surfaceDiffuses through the respiratory surface
Carbon dioxide gasDiffuses into the plantNot required
WaterDiffuses into the rootIngested into the digestive system
GlucoseProduced by photosynthesisIngested into the digestive system as either simple or complex carbohydrates, and absorbed into the bloodstream
Lipids/proteinsProduced by the plant from glucose and mineral ionsIngested into the digestive system and absorbed into the bloodstream as amino acids, fatty acids or glycerol
Mineral ionsMove into the plant through the roots by diffusion and active transportIngested into the digestive system and absorbed into the bloodstream