Objective 8: Living Organisms Respond To Environmental Stimuli (still needs details)

  • Why environmental stimuli are variable.
    • Global factors&emdash;earth in space, axis tilts leading to seasons, ice ages, plate tectonics, etc
  • Why organisms respond to differing and variable environmental signals.
    • Adaptation is the key to evolutionary success. Some examples: life cycles, migration patterns, seasonal behavior, etc.
  • Types of environmental stimuli
    • abiotic: temperature, light, gravity, air pressure, differing soils, etc.
    • biotic: symbiosis (various types), predator prey, pheromones to French
    • consider abiotic and biotic factors on several levels: molecular, organismal, community, and ecosystem. Ecosystem examples: reefs, tropical forests, etc.
  • How organisms respond to environmental signals.
    • Use important examples such as eyes in animals and photomorphogenesis in plants. Consider these at several levels, for example perception, photochemistry, signal transduction pathways, developmental and behavioral responses.
  • Humans change environmental stimuli. Examples include deforestation, algal blooms, air pollution, thermal pollution, greenhouse effect, genetically modified crops, drug resistant organisms.