practical

• Describe quadrat practical to study distribution of small organisms

  place a 1cm2 quadrat on ground at a random point within first sample area

  count all organisms inside quadrat

  repeat as many times as you can

  work out mean number of organisms per quadrat within first sample area

  repeat all in second sample area

  compare the two means
• Describe how to work out population size of an organism in one area

  work out mean number of organisms per m2

  multiply mean by total area of habitat