Biology 3.2 - Distribution of organisms

• What is an abiotic factor? Example...

  - A non living factor that influences where organisms can live / the range of species found
• What is a biotic factor? Example...

  - A living factor which can influence where an organism lives (which may also affect the life of another organism).
• How to measure light intensity

  Use a light meter. Hold the meter in the soil and point at the direction of maximum light intensity
• How to measure temperature

  Use a thermometer for air or a temperature probe for soil. Make sure to wipe clean before each use.
• How to measure soil moisture

  Using a soil moisture meter. Make sure to wipe clean before each use
• How to measure soil pH

  Use a pH meter. Make sure to wipe clean before each use
• What methods are used to identify organisms?

  Paired statement keys - you answer questions to eventually find your organism

  
• What is an indicator species?

  Species that indicate environmental quality or levels of pollution by their presence or absence
• What are examples of indicator species?


  Lichens - biological indicator of air pollution.
• What is an example of sampling techniques?

  Quadrats - Placed randomly for an accurate reading the abundance of something in an area

  Pitfall traps - Used to sample small invertebrates, they fall into the traps and then you can count them
• What is an example of biotic factors?

  • Predation
  • Grazing
  • Competition