1. Unit 3 Parts of the Plant and Their Functions
Plant life is essential for life on earth.
-Plants provide food, oxygen, and enjoyment
Plants are made up of four basic parts
1. Leaves 2. Stems
3. Roots 4. Flowers

2. Leaves Leaves are the food factory of the plant.
External Leaf Structure
Petiole - leaf stalk
Blade - usually the flat part
Veins – structural frame
Margin-edge of leaf

3. Parts of a leaf

4. Leaves help in the identification of horticulture plants.

7. 6CO2 + H2O + Sunlight = C6H12O6 + 6O2
Internal Leaf Structure
Epidermis-skin of the leaf
Chloroplasts-process food
Photosynthesis - is the process by which carbon dioxide and water in the presence of light are converted to sugar and oxygen.
Carbondioxide+water+sunlight=sugar+oxygen
6CO2 + H2O + Sunlight = C6H12O6 + 6O2
Guard Cells
Open and Close stoma to allow the leaf to exchange gases

8. Stems 2 Main Functions Movement of materials
Support the leaves and reproductive structures
Also used for food storage, reproduction methods
External Stem Structure
Terminal Bud
Axillary Bud
Bud Scale Scar
Lenticle

10. Cross Section of a Stem Internal Stem Structure
Phloem – manufactured food travels down
Xylem – water and minerals travel up
Cambium – produces the new stems
Cross Section of a Stem

11. Roots Functions Anchor the plant and hold it Upright
Absorb water and minerals from the soil and conduct them to the stem
Store large quantities of plant food
Propagate or reproduce some plants

13. Flowers Complete Flower – 4 Main Parts Both Male and Female Parts
Incomplete Flower – has only the male or female parts.
4 Main Parts
Sepals – protect the flower bud
Petals – leaves (attract insects)
Stamens – Male reproductive parts
Pistil – Female Parts