Sources & Sinks
These essential ingredients for plant life are taken up and produced in different parts of the plant. As a result, a substantial amount of tree biomass is dedicated to moving water, nutrients, and sugars between the places where they enter the plant and where they are used.
To describe where an essential resource is taken up or synthesized, and where it is used in a plant, biologists use the terms “source” and “sink”.
- A source is a location in a plant where a resource is taken up (ex. water and nutrients) or synthesized (glucose).
- A sink is a location where a resource is used.