Translocation

• What is glucose converted into in photosynthesis 


  Sucrose
• Where is the source of sucrose 


  Leaves
• What is translocation 


  Process of transporting sucrose around the plant
• True or false: Plants MAKE glucose and TRANSPORT sucrose

  True
• What is the phloem's role

  Transports dissolved sugars to where they are needed -> amino acids + sucrose
• How are the phloem adapted 


  • Columns of elongated living cells (called sieve cells with small pores in end walls to allow cell sap to flow)
  • Transport nutrients
  • Movement in both direction (translocation)
• What's the difference between source cells + sink cells

  Source cell=where nutrients are made

  Sink cell=where nutrients are needed
• Describe the journey of sugars made in photosynthesis 


  Glucose (product of photosynthesis) converted to sucrose -> dissolved in water by sieve cells by diffusion/active transport ->transported through phloem vessels -> sink cells
• Why do companion cells need lots of mitochondria 


  To provide energy for active transport
• Explain how substances move through plant by translocation (4 marks)

  • Glucose produced by photosynthesis-> converted into sucrose
  • Sucrose dissolved in water in source cells
  • Transported through phloem vessels to sink cells by translocation
  • Higher concentration in source than sieve cells = sucrose moved via diffusion
  • Lower concentration in source than sieve cells = sucrose moved via active transport
  • Mitochondria in companion cells
• Draw diagram showing structure of phloem vessel
• Draw diagram showing structure of xylem vessel
• What determines how sucrose enters the sink cells 


  The concentration levels