topic 9

• How to estimate the number of animals in a certain area using a belt transect


  • use a quadrat and mark a line
  • count how many animals are in that area
  • multiply for estimate and calculate the mean numbers from all the samples
• what should be kept the same when sampling

  • same type of day
  • use same equipment
  • same sample length
• How to measure light intensity(anything) using a belt transcent

  • place a quadrat along a tape measure
  • measure light intensity at different distances
  • measure staining neets along quadrats
• why is all the biomass from prey not past to predator

  • prey uses some of the biomass for respiration
  • not all of the prey is eaten
• why does decreasing water content decrease decat

  • reduces numbers of microrganismsa that can be producex
  • reduces decay process
• why does sewqage pollution decrease oxygen water

  • sewage leads to algae formation killing plants which are unable to undergo photosynthesis
• How does dried food and vacuumed food not composed

  dried - no water,microrganisms can't survive without it

  vacuumed - no oxygen can't undergop respiration
• How does crop rotation improve the soil

  • legumiouas crops
  • have nitrogen fixing bacteria in the roots and puts nitrates back into the soil
• what is a community

  • all organisms of different species in a habitat
• what is a population

  • all organosms of the same species living in a habitat
• what is a habitat

  • where an organism lives
• what is interdependence

  • all animals rely on each other