1. How we all connect together …
Plants & People
How we all connect together …

2. People & Plants How do humans use plants?
Food
Fibre (building materials)
Medicines
Plants are vital to our survival!

3. Plants & Ecosystems We know for humans … but for the environment?
Plants filter our air (Breath in what we breath out)
Plants help filter our water (Clean up dirty water)
Plants help keep soil in place (Roots hold earth together)

4. Plants & Food Mind – blowing fact …
75% of the world’s food supply is based on seven major crops …
- wheat - rice corn - sorghum
- potatoes barley cassava

5. Plants & Fibre
While many things are manufactured … we still use 3 natural fibres!
Cotton Hemp Flax

6. Cotton (Currently) The world’s most important non- edible plant!
Their structure (strong, flexible, gradual spiral) makes them extremely versatile!

7. Hemp Oldest cultivated plant in the world!
Less negative effect than other fibres
Hemp Factoids!
Hemp paper lasts longer than wood pulp paper
Ready for harvest in 1 year
First Bible printed on hemp paper
Nothing eats it so no pesticides required!

8. Flax Grows in nothern, cooler regions
Fibres in stems is 2 to 3x stronger than cotton
Used in a variety of different process (oil paints and varnish)

9. Plants & Medicines
Before over the counter medicine existed people used the plants around them
Ginger = upset stomach
Bark of white willow = pain killer
How Aspeirin was developed
Hundreds of examples exists like Morphine, Codeine, etc …

10. Plants & Transportation
Rubber (latex) changed our world
Comes from Brazilian Rubber Tree (Only source in the world)
Synthetic exists but not as good

11. Plants & Fuel Wood burned for fuel Old plants provide fuel Died Buried
Compressed
Structural / Chemical Changes
Became Coal
Burn Coal for Fuel

12. Plant Life – Roots
Plants are like icebergs, they work like this …

13. Plant Life – Roots What do they do? Root Crops Absorb minerals / water
Anchor / support plant
Store food
Root Crops
You eat root vegetables you are eating a root!
WHOA!

14. Diffusion & Osmosis Diffusion is key for plant roots
Moving and distributing evenly from areas of higher concentrations to lower concentration

15. Diffusion & Osmosis Diffusion is key for plant roots
Moving and distributing evenly from areas of higher concentrations to lower concentration

16. Osmosis Diffusion of water through a differentially permeable membrane
(Like a mesh bag with sand and marbles … the sand can go through but not the marbles)
Cells in roots are differentially permeable
(Allow some things such as water & nutrients and hold the rest out)

17. Salt
Gravel
H2O

18. Stems Refer to page 108 in your text book.
I would know that diagram of a tree trunk and the layers *hint*

19. Stems Cont …
Support
They provide support for leaves so they get enough sunlight to make food
Some are tiny (few mm) and some are huge (100+m long)

20. Stems Cont … Food Storage
They store food produced by the leaves
Underground vegetables (i.e.: potatoe) have tubers which store food in the form of starch for the potatoes to use
Factoid!
The barrel cactus does this so well it can last a year without water

21. Leaves Leaves turn green due to chlorophyll
Leaves use the sun to make food turning the light into chemical energy
But how…?
They need to ingredients
Water
Carbon Dioxide

22. Leaves Cont … Water + Cardon Dioxide = Sugar
This is the plants energy storing chemical
The process is known as photosynthesis!
Video Explanation!

23. Stoma/Stomata Open during day Close at night
Carbon Dioxide enters and goes into chloroplasts
Reaction occurs that produces sugar and oxygen

24. Leaves Cont … The sugar feeds the plant The oxygen is released
Simple Video
The sugar feeds the plant
The oxygen is released
Plant need oxygen too!
At night, when no sunlight is around, plants release CO2 and absorb Oxygen
This is done through guard cells (via osmosis
Swell with water = open & release of CO2 & water vapour
Lose water = closed
This is transperation (i.e.: how water moves up)

25. Moving Water
Roots are pulling water in and it is going up via root hairs and osmosis
Leaves are pulling water from xylem as well
Powerful stuff!