10.1.9 Moving substance around plant: Phloem & translocation

• Phloem


  Made of living cells stacked up end to end
• Xylem


  Made of dead cells stacked up end to end
• Translocation


  The transport of sucrose (and amino acids) in phloem from source to sink
• Sucrose can move upwards or downwards to get from source to sink
• Source


  An area of a plant where carbohydrates are made in photosynthesis (e.g. leaves)
• Sink


  Areas where carbohydrates are required for respiration (e.g. areas where energy is required for growth such as roots/shoots/flowers) or carbohydrates are stored (e.g. fruits, tubers)
• There are times of the year when sinks can become sources