Phloem: Downward Movement on Nutrients in Plants

The video explains the phloem system in plants, focusing on sieve tube elements and companion cells. It describes how sap, rich in water and sugars, is transported from sugar sources to sugar sinks. The process of photosynthesis in leaves produces sugars, creating a diffusion gradient that draws water into phloem cells, generating turgor pressure to move sap efficiently.

What is the difference between 'sugar sources' and 'sugar sinks'?

How does turgor pressure affect the flow of sap in the phloem?