Plant Parts Leaves

1
Plant Parts - Leaves
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
Functions of Leaf Cells

• Epidermis - Protects leaf from losing H2O
• Palisade Layer - Contains chloroplasts
• 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.

6
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.

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.