10. Plant Organ Systems

System – ?

System –

• a group of tissues & organs that perform specific functions

Shoot System?

Shoot System

• supports the plant,

• performs photosynthesis,

• & transports sap

Root System – ?

Root System –

• takes in water & nutrients

from the soil

• & transports them to the shoot system

• plants cannot survive without ?

• plants cannot survive without water

plants cannot survive without water

WHY?

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

WHY?

• 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)?

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

Moving Water Through the Systems

“The pull from above” ?

“The pull from above”

• while the roots push the water column from below,

• the leaves pull from above.

• Transpiration aids in this process.

The Movement of Maple Sap

• In the spring?

• In the summer and fall? =

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.