10. Plant Organ Systems

System – ?

System –

• a group of tissues & organs wroking together that perform specific functions

Shoot System?

Shoot System

• supports the plant,

• performs photosynthesis,

• & transports sap

Root System – ?

Root System –

• Absorbs water and nutrients and transports them to the shoot system.

• plants cannot survive without ?

• plants cannot survive without water

• Why do plants need water?

• Why is too much water bad for plants?

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

Q: Why is too much water bad for plants

• 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”

• Water enters roots by osmosis

• Water moves toward the centre of the root into the xylem vessels

• The pericycle stops water from leaking backward

• root Pressure builds up in the xyxlem

• Water gets pushed upward

Think of squeezing toothpaste from the bottom 🪥

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.

• Water evaporates from leaves

• This is called transpiration

• As water leaves the leaf, it pulls more water up

Like sipping through a straw 🥤

The Movement of Maple Sap

• In the spring?

• In the summer and fall?

The Movement of Maple Sap

In the spring:

• Sugar moves UP

• Roots → leaves

• Purpose: grow leaf buds

Sugar form: sucrose

In the summer and fall:

• Leaves make glucose

• Sugar moves DOWN

• Stored in roots

Stored as:

• Glucose

• Sucrose

• Starch