1. Leaf Structure and Gaseous Exchange
WALT – Explain how CO2 and Oxygen enter/ leave the plant
WILF –
Function of leaf
Diagram of leaf
Diagram of stomata inc 2 guard cells
Questions answered

2. Leaves

3. Function of leaves Trap light energy for photosynthesis
Producing sugar from photosynthesis
Exchange of gases – oxygen and carbon dioxide

5. Structure Helps to catch more light energy
Wide
Helps to catch more light energy
Thin
Help get carbon dioxide from bottom to top of leaf for photosynthesis

6. Leaf structure
Greener on top
CO2 gets in here

7. Leaf diagram – palisade layer
Most chlorophyll
CO2

8. Leaf cell - palisade Position? Upper surface of leaf Features?
Box shape
Chloroplasts
Function?
Photosynthesis

9. Gas exchange
Leaves are designed to allow carbon dioxide to get to the main chlorophyll layer at the top of the leaf
They have small holes called stomata on the under surface
Each hole is open & closed by 2 guard cells

10. Leaf diagram – stoma and guard cells

11. Stoma position

12. Stoma is a small hole Its size is controlled by 2 guard cells closed
open

13. Stoma function is for gas exchange in the leaf
oxygen
Guard cell
Provided plant is photosynthesising
Carbon dioxide

14. Stomata open and close at different times of the day
When it is light the plant needs CO2 for photosynthesis so the stoma open
At night (darkness) they close

15. Gas exchange

16. What controls the flow of gases into and out of the leaf?
Complete the sentence :
Theses stomata are made from 2 ___________ cells. They open during the day to let __________ into the leaf and _____ at night .

17. Roots – function and structure
Hold plant in position
Absorb water and minerals from the soil
Specialised cells to increase surface area for water intake

18. Wheat seed
Root hairs
Fragile parts of cells that grow from the main root
They massively increase the surface area for absorption

19. Root hair cells (x150)

20. Root ‘B’ has had the hairs damaged -

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