2.2 Plant Organ Systems Learning Objective: Learn to describe how plant organs work together to meet the needs of a plant. Keywords: System Root System.

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2.2 Plant Organ Systems Learning Objective: Learn to describe how plant organs work together to meet the needs of a plant. Keywords: System Root System Shoot System

Moving Water Through the Systems (Pages 72-74) “The push from below” – Water enters the root by osmosis and moves toward the centre of the root into the xylem vessels. The pericycle prevents the water from moving backward. Root pressure builds up in the xylem and pushes water “up”. Tiny root hairs increase the surface area of the root. Copyright © 2010 McGraw-Hill Ryerson Ltd.

Moving Water Through the Systems (Pages 72-74) “The pull from above” – While the roots push the water column from below, the leaves pull from above. Transpiration aids in this process. Unique Properties of Water: 1) Cohesion – the ability of water molecules to cling to each other 2) Adhesion – ability of water to stick to other surfaces (e.g. wall of xylem vessel) Copyright © 2010 McGraw-Hill Ryerson Ltd.

Moving Water Through the Systems (Pages 72-74) http://www.youtube.com/watch?v=CT4pURpXkbY http://www.youtube.com/watch?v=CT4pURpXkbY Copyright © 2010 McGraw-Hill Ryerson Ltd.

The Movement of Maple Sap (Page 75) In the spring, sucrose from the roots flows “upward” to help produce leaf buds. In the summer and fall, the leaves produce glucose that moves “downward” to be stored in the roots. Glucose Glucose Sucrose Sucrose Starch Starch Copyright © 2010 McGraw-Hill Ryerson Ltd.

Transport of Sucrose (sugar) Through a Plant http://www.youtube.com/watch?v=-b6dvKgWBVY http://www.youtube.com/watch?v=-b6dvKgWBVY Copyright © 2010 McGraw-Hill Ryerson Ltd.