1. Plant Parts - Leaves What are YOU lookin’ at?
2001 AgriTeach.comTM (12901ms)

2. Why are plants important?
They are the direct or indirect source of all food for animals.
All plant life produces oxygen
What other benefits can you think of?
Beautification
Freshening air
Block wind
Prevent soil erosion
Provide shelter for animals
Building materials and fuels

3. Basic Parts of the Plant
Can you think of the 4 basic parts & their functions?
Leaves:
food factory of the plant
Stems:
support and moving materials
Roots:
anchor plant, store food, absorb nutrients, reproduction
Flower:
forms fruit and seeds, allows for pollenation

4. Leaf Anatomy

5. Internal Leaf Structure
How many different types of cells make up leaves?
FIVE: upper epidermis, palisade layer (has chloroplasts), spongy tissue, lower epidermis, and guard cells.

6. Functions of Leaf Cells
Epidermis - Protects leaf from losing H2O
Palisade Layer - Contains chloroplasts, which are responsible for photosynthesis
Spongy Tissue - Allows for gas exchange
Lower Epidermis - Contains most stoma
Stoma/Guard Cells - Open and close to regulate amount of water in the leaf; prevents wilting.

7. Electron Micrograph of Leaf
Can you identify the layers?

8. Photosynthesis Photosynthesis is a chemical reaction:
6CO2 + 6H2O + Light = C6H12O6 + 6O2
Left over Oxygen
Carbon Dioxide
Water
Glucose (energy)
Plants also respirate, much like animals when light is not available.
They do, however, make much more O2 than they use.