BRAINCAKETranslocation in the Phloem
Translocation is the movement of organic substances (assimilates), such as sucrose and amino acids, through the phloem. It is an active process that requires energy.
Assimilates move from a source to a sink.
1. A source is where assimilates are made or released, for example photosynthesising leaves, or a storage organ such as a potato tuber when it breaks down its stored starch in spring.
2. A sink is where assimilates are used or stored, for example growing root and shoot tips, developing fruits and seeds, and storage organs while they are being filled.
Sign in free to see the rest of this lesson, the R.E.C.I.P.E. recall steps and the quiz
BrainCake is free. Make an account in seconds and pick up where this page stops.
Key terms in this lesson
- non-reducing sugar
- A sugar, such as sucrose, that lacks a free reactive group able to reduce Benedict's reagent, making it chemically less reactive.
More in Transport in Plants
- Modelling Transpiration
- Measuring the Rate of Water Uptake
- Factors Affecting Transpiration
- Root Pressure
- Phloem Loading
- The Symplast Pathway
- The Apoplast Pathway
- Phloem Unloading
All 21 lessons in Transport in Plants · All Edexcel AS-level Biology topics