Section 2.2 Plant Organ Systems

Plant Organ Systems System – a group of tissues and organs that perform specific functions Shoot System –supports the plant, performs photosynthesis, and transports sap Diagram 2.2-1 Root System – takes in water & nutrients from the soil and transports them to the shoot system

Importance of Water plants cannot survive without water WHY? 1. nutrients need to be dissolved in water in order to be absorbed 2. photosynthesis cannot take place without water too much water is also bad if spaces between soil molecules are filled with water, there will not be enough room for oxygen

Moving Water Through the Systems “The push from below” How does water move upward in a plant (against gravity)? 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 Diagram 2.2-2

Moving Water Through the Systems “The pull from above” while the roots push the water column from below, the leaves pull from above. Transpiration aids in this process. Diagram 2.2-4

The Movement of Maple Sap 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

Things you should now know: Section 2.2 Review Things you should now know: the function and characteristics of the root and shoot systems the function and properties of xylem and phloem tissue the tissues and processes involved in moving water and nutrients the movement and storage of the products of photosynthesis

Homework Read pg. 70-75 in the student textbook. Complete questions # 1-6