plant tissues

• epidermal tissue:

  • covers the whole plant
  • covered with a waxy cuticle - prevents water from moving out
  • helps reduce water loss by evaporation
• palisade mesophyll tissue:

  • underneath epidermal tissue
  • alot of chloroplast for photosynthesis
  • positioned on the top of the leaf - receive alot of light
• spongy mesophyll tissue:

  • underneath palisade mesophyll
  • has alot of air spaces
  • allows gases to diffuse in and out of cells
• xylem:

  • found in roots, stems, and leaves
  • made of dead cells joined together
  • strengthened with lignin - makes it waterproof
  • has some holes along the tube called bordered pits - mineral ions go to specific places
  • allows movement of water and mineral ions from the roots to the stem to the leaves
  • when water goes to the leaves it transpires