Unit 4 · Plant Form and Function
What the phloem carries, sources and sinks, the pressure-flow (mass flow) hypothesis with loading and unloading, evidence for and against it, and how xylem and phloem transport are compared.
Deshapriya Senevirathne. B.Sc. (Hons) Biology Special, University of Peradeniya — graduated with a class pass. All the content and lessons in A/L Biology on Paadama are reviewed by Deshapriya Senevirathne, and the lessons are taught by him.