1. Chapter 7
Plant Systems

2. Plant Functions Make and store food nutrients for plants’ use
Stabilize soil
Replenish Earth’s oxygen
Enhance world’s beauty

3. Plant Systems
Leaves
Stems
Roots
Flowers

4. Leaves Manufacture food Store food Sugars and carbohydrates
Fats and proteins
Store food
Livestock: Hay
Humans: Cabbage, lettuce, spinach

5. Leaf Structure

6. Photosynthesis Leaf makes food for the plant
Sunlight as energy
CO2, H2O, nutrients as building blocks
Occurs in two stages of reaction
Light
Dark
Respiration reverses process

7. Leaf Types Basic parts Classification schemes Blade Petiole
Vein orientation
Stem arrangement
Shape

8. Stems Functions Types Support plant Conduct water and nutrients
Store and carry food
Types
Herbaceous
Woody

9. Roots Functions Types Hold plant in soil Capture nutrients
Provide food source
Types
Tap
Fibrous

10. Nutrient Absorption Root hairs take in water, nutrients
Water movement creates osmotic pressure
Water into vascular cylinder
Nutrients into phloem
Some plants provide own nitrogen

11. Summary Most Earth life relies on plants
Agriculture provides plants for food and fiber
Scientists will continue to seek new plants and new plant uses