BP2-plant structures and functions

• leaf - photosynthesis, gas exchange

  water evaporates out
• xylem- transports water and dissolved mineral ions from the roots to the leaves

  Transpiration- unidirectional, impregnated lignin, waterproof and strong
• • stomata (guard cell)gas enter and leave
• meri-stem

  • stem cell production
• roots

  • water enters through osmosis, mineral ions by active transport
  • large surface area
  • mitochondria to release energy
• phloem

  • tube of cells that carry sugars
  • translocations- bidirectional