AQA - Additional Science - Photosynthesis

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Mind Map on AQA - Additional Science - Photosynthesis, created by saffy1999 on 24/10/2015.
saffy1999
Mind Map by saffy1999, updated more than 1 year ago More Less
Ellie Ashford
Created by Ellie Ashford almost 9 years ago
saffy1999
Copied by saffy1999 almost 9 years ago
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AQA - Additional Science - Photosynthesis
  1. Green plants absorb light energy using chlorophyll in their leaves. They use it to react carbon dioxide with water to make a sugar called glucose. The glucose is used in respiration, or converted into starch and stored. Oxygen is produced as a by-product.
    1. Factors
      1. Temperature
        1. If it gets too cold, the rate of photosynthesis will decrease. Plants cannot photosynthesise if it gets too hot.
        2. Carbon Dioxide Concentration
          1. Sometimes photosynthesis is limited by the concentration of carbon dioxide in the air. Even if there is plenty of light, a plant cannot photosynthesise if there is insufficient carbon dioxide.
          2. Light Intensity
            1. Without enough light, a plant cannot photosynthesise very quickly, even if there is plenty of water and carbon dioxide. Increasing the light intensity will boost the speed of photosynthesis.
          3. Process
            1. ~ Light energy is absorbed by chlorophyll, a green substance found in chloroplasts in some plant cells and algae ~ Absorbed light energy is used to convert carbon dioxide (from the air) and water (from the soil) into a sugar called glucose ~ Oxygen is released as a by-product.
            2. Equation (to right)
              1. Some glucose is used for respiration, while some is converted into insoluble starch for storage. The stored starch can later be turned back into glucose and used in respiration.
                1. Storage & Use Of Glucose
                  1. Storage
                    1. Glucose is needed by cells for respiration. However, it is not produced at night when it is too dark for photosynthesis to happen. Plants and algae store glucose as insoluble products. These include: Starch Fats and oils.
                    2. Use
                      1. Some glucose is used for respiration to release energy. Some is used to produce: Cellulose - which strengthens the cell wall Proteins - such as enzymes and chlorophyll. Plants also need nitrates to make proteins. These are absorbed from the soil as nitrate ions.
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