Introduction to Photosynthesis

1
Introduction to Photosynthesis
2
Plant Anatomy

• Seed plants have three main organs
• Roots
• Stems
• Leaves

3
The Reactants

• What do plants need to make their own food?
• Sunlight
• Water (H2O)
• Carbon dioxide (CO2)
• How do plants get the reactants?
• Sunlight absorbed by leaves
• H2O absorbed by roots transported by stems
• CO2 enters through small pores on the underside
  of leaves called stomata

4
Stomata (singular stoma)
5
The Products

• What do plants make during photosynthesis?
• Sugars, specifically glucose (C6H12O6)
• Oxygen (O2)
• What do they do with the products?
• C6H12O6 used as an energy source or stored as
  sugars or starches
• O2 released through the stomata in leaves

6
The Chemical Formula

• 6CO2 6H2O C6H12O6 6O2
• You must memorize this equation!

7
Location of Photosynthesis

• Chloroplasts, usually located in the leaves

8
Leaves an assignment

• Read pp. 595-598 in your textbook
• Take notes on the following topics

• Epidermis
• Cuticle
• Vascular tissue (refer to p. 580)
• Xylem
• Phloem
• Vein

• Photosynthesis
• Mesophyll
• Palisade mesophyll
• Spongy mesophyll
• Stomata (stoma)
• Guard cells
• Transpiration

• Draw label Figure 23-18 (p. 596)