Leaf Structure

• A - Cuticle

  B - Upper Epidermis

  C - Palisade mesophyll

  D - Spongy Mesophyll

  E - Lower Epidermis

  F - Stomata

  G - Guard Cells


  Label the diagram

  
• Cuticle

  A waxy layer to reduce water loss by evaporation
• Upper epidermis

  It is transparent so that light can pass through it to the palisade layer.
• Palisade mesophyll

  Has a lot of chlorplasts that absorb light for photosynthesis. Cells are tightly packed.
• Spongy mesophyll

  Cells which have lots of gaps between them like a sponge. The air spaces allow gas exchange to take place.
• Lower Epidermis

  Lower surface layer of the leaf. Has holes called the Stomata which are controlled by the guard cells.
• Stomata

  Small holes in the lower epidermis that allows gases to diffuse in and out of the cell. These are controlled by guard cells.
• Guard cells

  Controls the opening and the closing of the stomata.
• A - Upper Epidermis

  B - Palisade mesophyll

  C - Spongy Mesophyll

  D - Lower Epidermis

  E - Guard Cells

  F - Cuticle

  G - Air space

  H - Stomata


  Label the diagram

  
• Xylem

  Transports water and minerals.
• Pholem

  Transports food made from photosynthesis
• Pholem

  • Transportation food made from photosynthesis
  • Has sieve plates
  • Found on the outside of the vascular bundle
  • Two way system
• Xylem

  • Transports water and mineral ions
  • Found in the centre of the vascular bundle
  • One way system upwards
  • Rich in lignin which supports the plant