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Chapter 7: Leaves - Coggle Diagram

- - - - has a blade of just one part
    - - has a blade divided into several individual parts
- - - - active trap
        
        moves during capture
        
        eg: leaves of sundew
        
        upper surface of foliage is covered with glandular trichomesthat secrete a sticky digestive liquid
        
        trichome and lamina are able to sense the present of insects
      - passive trap
        
        incapable of movement
        
        has numerous stomata and vascular bundles as well as mesophyll
        
        eg: pitcher leaves of Nepenthes
        
        thin, parenchymatous and capable of photosynthesis
        
        lamina is tubular and secrets a watery digestive fluid
- - - - layer of cells along the upper surface of most leaves
      - main photosynthetic tissue of most plant
    - - lower portion of leaf permits carbondioxide to diffuse rapidly away from stomata into all parts of leaf's interior
  - - - water loss through the epidermis
      - can be serious problem is soil is dry, root cannot replace water
- - - - At the base of meristem, cells just interior to the protoderm grow outward called leaf primordium
      - Grows so rapidly that it becomes taller than the shoot apical meristem
      - As leaf primordium grows upward, it increases the thickness, establishing the bulk of midribs