How Phloem Moves Sugars in Plants

Phloem moves sugars and other materials through plants. In angiosperms, sugar production is mostly limited to photosynthetic cells in the leaves. These leaves act as sugar sources because they make more sugar than they use. Roots, shoots, flowers, and fruits are usually sugar sinks because they need more sugar than they can ...

Photosynthesis generates sugar in plant leaves. However, the sugar is often needed in distant parts of the plant. Translocation is the process that distributes the products of photosynthesis to other plant tissues.

Leaves are typically called sugar sources, which are sites that produce more sugar than they consume. In contrast, the roots...