B7 - The spread of diseases

• Plant Defences:

  Physical - cellulose cell walls, bark, tough waxy cuticle

  Chemical - antibacterial chemicals, poison production

  Mechanical - thorns and hairs, mimicry of poisonous plants, drooping leaves
• • Bacteria cause diseases by producing toxins that can damage tissues
  • Some examples of bacterial diseases are: Gonnorhea and Salmonella
• Ways pathogens can spread:

  • Air
  • Water
  • Direct Contact