Plant response

• Name 5 physical plant responses to a herbivore ?


  Thorns, stings, spikes, hairy leaves and inedible tissue
• Name 3 chemical plant response to a herbivore ?


  Tannins, alkaloids and terpenoids.
• tannin = very bitter tasting chemical which are toxic to insects
• Alkaloid = nitrogenous, bitter tasting chemicals that affect metabolism of herbivore
• Examples of alkaloids ?


  caffeine, cocane and morphine
• Terpenoids = essential oils that can be toxic to insects and fungi
• example of terpenoids ?


  citronella
• Pheromones = chemicals used to communicate danger
• Examples of abiotic stress?


  High winds, excess water, lack of water and temperature change
• Name 5 plant responses to abiotic stress ?


  leaf loss

  daylight sensitivity

  abscission

  preventing freezing

  stomatal control
• Why do plants drop leaves when temperature drops ?


  The rate of photosynthesis decreases so it is more energy efficient for the tree to lose its leaves