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Transport of Nutrients and Water in Plants
- Water is absorbed by the roots of plants and then distributed to the rest of the plant.
- Root hairs and mycorrhizae increase the surface area available for water absorption.
- Water potential is influenced by solute concentration and pressure. Water moves from areas of higher water potential to areas of lower water potential.
- Water and minerals enter the root and travel to the vascular cylinders. Two routes for lateral movement of materials through the root are the symplast and apoplast routes.
- The endodermal cells surrounding the vascular cylinder are tightly packed together and regulate the entry of water and minerals into the vascular cylinder.
- Transport of water and solutes through the xylem relies on bulk flow. Bulk flow is the result of a pressure gradient created by the loss of water from leaves through transpiration. The cohesive and adhesive properties of water allow bulk flow to occur by capillary action.
- Phloem sap moves from a sugar source to a sugar sink during translocation. A sugar source is a site of sugar production. A sugar sink is a site of either the consumption or storage of sugar.
Transport of Nutrients and Water in Plants
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
- Intro
- Review of Plant Cell Structure
- Cell Wall, Plasma Membrane, Middle lamella, and Cytoplasm
- Plasmodesmata, Chloroplasts, and Central Vacuole
- Water Absorption by Plants
- Apoplast and Symplast Pathways
- Xylem Structure
- Bulk Flow
- Phloem Structure
- Translocation
- Example 1: Match the Following Terms to their Description
- Example 2: Water Potential
- Example 3: Bulk Flow
- Example 4: Sugar Sink and Sugar Source
































1 answer
Fri Sep 14, 2012 3:18 PM
Post by Jasmin Herro on September 14, 2012
This lecture stops playing at Translocation
1 answer
Sun Apr 28, 2013 11:47 PM
Post by Zoe Loos on April 22 at 01:32:42 AM
At the the time 6:46 you said that water moves from high to low solute concentration, I though it was from low to high solute concentration ?