GCSE AQA Biology B2.2

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  • B2.2 Organisms in the Environment
    • Photosynthesis
      • Word Equation - Carbon Dioxide + Water + (Light Energy) --> Glucose and Oxygen
      • Formula Equation - 6CO2 + 6H20 -->  C6H12O6 + 6O2
      • Only occurs in plants
      • Iodine is used to test for starch (brown to blue)
      • Chloroplasts in plants contain chlorophyll (absorbs light energy)
    • Limiting Factors
      • What do plants need?
        • Light
        • Warmth
        • Carbon Dioxide
        • Water
      • What do the  corresponding graphs look like?
        • Light
          • Brighter the light, faster the rate of photosynthesis
        • Temperature
          • As the temperature rises, rate of photosynthesis rises
          • Until 40-50ºC, then the enzymes denature and photosynthesis will stop
        • Carbon Dioxide
          • Atmosphere = 0.04% CO2, therefore, CO2 often the limiting factor
          • Increase CO2 levels, rate of photosynthesis will rise
          • CO2 levels increase at night due to respiration in plants
    • How do plants use glucose?
      • Respiration - to provide energy for cell functions
      • Growth
        • Glucose and Nitrate Ions can make amino acids which in turn are converted in to proteins and can be used in growth
      • Repair
      • Storage - glucose is stored as starch


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