translocation

The movement of sucrose and amino acid [organic molecules] in phloem

• i.e. products of photosynthesis from leaves

  • 6CO₂+6H₂O --(Light energy and chlorophyll)-> C₆H₁₂O₆+6O₂

    • Glucose

      • Highly reactive

        • Therefore easily used as it travels

      • Very soluble

    • Sucrose

      • Sparingly soluble

        • Not as reactive

Sources and sinks

• A source

  • Structure/part of the plant where the organic molecules/substances are made

    • e.g. leaf

    • Green stem

• A sink

  • The structure/part where the substances/molecules are transported to for storage or usage

    • e.g. roots

      • Like potatoes, onions, carrots

Class task

• Why is it that sources and sinks can change with a change in season 

  • Because God told them to

  • In some seasons the leaves die

    • Autumn and winter

    • The source cannot be the leaves anymore

    • The roots provide the food that was stored in summer

    • Anywhere else on the plant can be the source now