b2

• Six plant TISSUES

  • Epidermis
  • Palisade mesophyll
  • Spongy mesophyll
  • Xylem
  • Phloem
  • Endodermis
• Epidermis

  • Covered with waxy cuticles to reduce water loss
  • Transparent to let light in
• Palisade mesophyll

  • Most photosynthesis happens
• Chloroplasts

  • Where photosynthesis occurs
• Cross section of leaf has xylem, phloem, and endodermal layer
• Spongy mesophyll

  • Has air spaces to allow diffusion of gases
• Xylem

  • Hollow tubes made of dead cells
  • Contains lignin for strength
  • Transports water and minerals
• Phloem

  • Elongated living cells
  • Has pores in end walls to let substances (like sugar) move from leaves to rest of plant
• Transpiration

  1. Stems from roots

  2. Meristem found at growing tips of shoots

  3. Transports food
• Translocation

  Food is processed and moved through phloem
• guard cells control the opening and closing of stomata by changing shape due to water uptake/loss