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Leaves (External Structure (Functions (Main reason is to photosynthesize,…

- - - - One part
    - - Multiple parts
        
        Small blades (leaflets
        
        Attached by petiolule
        
        To the rachis
        
        Can be palmately
        
        Leaflets attached at the same point
        
        Can be pinnately
        
        Leaflets attached individually to the rachis
  - - - Helps with CO2 levels
      - Cools leaf off
      - Keeps insects away
    - - These blades can flex and flutter with no petiole
- - - - Helps reduce water loss
- - - - Provide shade to upper surface
      - Prevent rapid air movement in the lower surface
      - Makes it hard for insects to walk and eat
      - Helps prevent dew drops and the prevention of CO2
    - - Waxy coating on epidermal cells
  - - - Palisade parenchyma
        
        Main photosynthetic tissue
      - Spongy mesophyll
        
        Lower portion of the leaf
        
        Prevents rapid CO2 diffusion
  - - - Minor veins branch out
        
        Mainly used for releasing water
        
        And loading sugar
      - Lateral veins branch out
        
        Conduct and support leaf blade
        
        May have a bundle sheath
  - - - Help protect shoot apical meristem
      - Helps photosynthesis is some species
- - - - These cells differentiate into mature tissue
      - Grows thicker as maturing
      - The cells that grow above the apical meristem