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Lesson Plan: Transport in the Xylem Biology

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to describe the mechanisms of water movement from the root to the leaves in the xylem.


Students will be able to

  • outline the role of the xylem in the movement of water through a plant,
  • describe theories for the ascent of water, including root pressure, capillary action, and imbibition,
  • explain how the cohesion–tension (cohesion–adhesion) theory can be used to describe the movement of water in the xylem,
  • compare the different theories of water movement in the xylem to explain why the cohesion–tension theory is the most widely accepted.


Students should already be familiar with

  • the basic structure of a plant (root, stem, and leaves).


Students will not cover

  • apoplastic/symplastic pathways.

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