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    • Statistical Anaylsis
    • ESS Topic 1 Foundations of ESS >
      • ESS Topic 1.1: Environmental Value Systems
      • ESS Topic 1.2: Systems and Models
      • ESS Topic 1.3: Energy and Equilibria
      • ESS Topic 1.4: Sustainability
      • ESS Topic 1.5: Humans and Pollution
    • ESS Topic 2 Ecosystems and Ecology >
      • ESS Topic 2.1: Species and Population
      • ESS Topic 2.2: Communities and Ecosystems
      • ESS Topic 2.3: Flows of Energy and Matter
      • ESS Topic 2.4: Biomes, Zonation and Succession
      • ESS Topic 2.5: Investigating Ecosystems
    • ESS Topic 3: Biodiversity and Conservation >
      • ESS Topic 3.1: Introduction to Biodiversity
      • ESS Topic 3.2: Origins of Biodiversity
      • ESS Topic 3.3: Threats to Biodiversity
      • ESS Topic 3.4: Conservation of Biodiversity
    • ESS Topic 4: Water and Aquatic Food Production Systems and Society >
      • ESS Topic 4.1: Introduction to Water Systems
      • ESS Topic 4.2: Access to Fresh Water
      • ESS Topic 4.3: Aquatic Food Production Systems
      • ESS Topic 4.4: Water Pollution
    • ESS Topic 5:Soil Systems and Terrestrial Food Production Systems and Society >
      • ESS Topic 5.1: Introduction to Soil Systems
      • ESS Topic 5.2: Terrestrial Food Production Systems and Food Choices
      • ESS Topic 5.3: Soil Degradation and conservation
    • ESS Topic 6: Atmospheric Systems and Society >
      • ESS Topic 6.1: Introduction to the Atmosphere
      • ESS Topic 6.2: Stratospheric Ozone
      • ESS Topic 6.3: Photochemical Smog
      • ESS Topic 6.4: Acid Deposition
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      • ESS Topic 7.1: Energy Choices and Security
      • ESS Topic 7.2: Climate change – Causes and Impacts
      • ESS Topic 7.3: Climate change – Mitigation and Adaptation
    • ESS Topic 8: Human System and Resource Use >
      • ESS Topic 8.1: Human Populations Dynamics
      • ESS Topic 8.2: Resource Use in Society
      • ESS Topic 8.3 Solid Domestic Waste
      • ESS Topic 8.4 Human Population Carrying Capacity
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      • Topic 1: Cell Biology >
        • Topic 1.1 Introduction to Cells
        • Topic 1.2 Ultra-Structure of Cells
        • Topic 1.3 Membrane Structure
        • Topic 1.4 Membrane Transport
        • Topic 1.5 Origin of Cells
        • Topic 1.6: Cell Division
      • Topic 2: Molecular Biology >
        • Topic 2.1:Molecules to Metabolism
        • Topic 2.2 Water
        • Topic 2.3: Carbohydrates and Lipids
        • Topic 2.4: Proteins
        • Topic 2.5: Enzymes
        • Topic 2.6: Structure of DNA and RNA
        • Topic 2.7: DNA Replication, Transcription and Translation
        • Topic 2.8 Cellular Respiration
        • Topic 2.9: Photosynthesis
      • Topic 3: Genetics >
        • Topic 3.1: Genes
        • Topic 3.2: Chromosomes
        • Topic 3.3: Meiosis
        • Topic 3.4: Inheritance
        • Topic 3.5: Genetic Engineering and Biotechnology
      • Topic 4: Ecology >
        • 4.1 Species, Communities and Ecosystems
        • 4.2 Energy Flow
        • 4.3 Carbon Cycle
        • 4.4 Climate Change
      • Topic 5: Evolution and Biodiversity >
        • Topic 5.1 Evidence for Evolution
        • Topic 5.2 Natural Selection
        • Topic 5.3: Classification of Biodiversity
        • Topic 5.4: Cladistics
      • Topic 6: Human Physiology >
        • Topic 6.1: Digestion and Absorption
        • Topic 6.2: The Blood System
        • Topic 6.3: Defense Against Infectious Disease
        • Topic 6.4: Gas Exchange
        • Topic 6.5: Neurones and Synapses
        • Topic 6.6: Hormones, Homeostasis and Reproduction
    • IB Biology HL Topics >
      • Topic 7: Nucleic Acids >
        • Topic 7.1 DNA Structure and Replication
        • Topic 7.2 Transcription and Gene Expression
        • Topic 7.3 Translation
      • Topic 8: Metabolism, Cell Respiration and Photosynthesis >
        • Topic 8.1 Metabolism
        • Topic 8.2 Cell Respiration
        • Topic 8.3 Photosynthesis
      • Topic 9: Plant Biology >
        • Topic 9.1 Transport in the Xylem of Plants
        • Topic 9.2 Transport in the Phloem of Plants
        • Topic 9.3 Growth in Plants
        • Topic 9.4: Reproduction in Plants
      • Topic 10: Genetics and Evolution >
        • Topic 10.1: Meiosis
        • Topic 10.2: Inheritance
        • Topic 10.3: Gene Pools and Speciation
      • Topic 11: Animal Physiology >
        • Topic 11.1 Antibody Production and Vaccination
        • Topic 11.2: Movement
        • Topic 11.3: The Kidney and Osmoregulation
        • Topic 11.4: Sexual Reproduction
    • Options >
      • Option D: Human Physiology >
        • D1: Human Nutrition (Core)
        • D2: Digestion (Core)
        • D3: Function of the Liver (Core)
        • D4: Function of the Heart (Core)
        • D5: Hormones and Metabolism (HL)
        • D6: Transport of Respiratory Gases (HL)
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image from activeagriculture.com

option C.6: (AHL) Nitrogen and phosphorus cycles

Picture

Essential idea:
  • Soil cycles are subject to disruption.
Nature of science:
  • Assessing risks and benefits of scientific research—agricultural practices can disrupt the phosphorus cycle. (4.8)
Understandings
C 6.1 U Nitrogen-fixing bacteria convert atmospheric nitrogen to ammonia.
C 6.2 U Rhizobium associates with roots in a mutualistic relationship
C 6.3 U In the absence of oxygen denitrifying bacteria reduce nitrate in the soil
C 6.4 U Phosphorus can be added to the phosphorus cycle by application of fertilizer or removed by the harvesting of agricultural crops
​C 6.4 U The rate of turnover in the phosphorus cycle is much lower than the nitrogen cycle.
C 6.5 U Availability of phosphate may become limiting to agriculture in the future
​C 6.6 U Leaching of mineral nutrients from agricultural land into rivers causes eutrophication and leads to increased biochemical oxygen demand
Application
C 6.1 A The impact of waterlogging on the nitrogen cycle
​C 6.1 A Insectivorous plants as an adaptation for low nitrogen
Skills
C 6.1 S Drawing and labelling a diagram of the nitrogen cycle
C 6.2 S Assess the nutrient content of a soil sample
Key Terms

Classroom Assignments:

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