Required Practical 9:Sampling Organisms

• What sampling technique is used to estimate the total population of daisies?

  Random sampling
• What is the purpose of using a quadrat in sampling?

  To count the number of organisms in a sample
• What are the dimensions of the quadrat used in the practical?

  0.5 meters by 0.5 meters
• How do students select random points for sampling?

  By drawing numbers from a bag
• If the first student draws the number 8, where do they move to?

  8 meter point on one tape measure
• What do students do after counting daisies in the quadrat?

  Return the numbers back to the box
• How many samples do students take in total?

  Ten samples
• What is the total area of the field being sampled?

  $400 \text{ m}^2$
• What is the area sampled if each quadrat is $0.25 \text{ m}^2$ and used ten times?


  $2.5 \text{ m}^2$
• How do you calculate the total population size of daisies?

  Using the equation provided
• Why is the population estimate considered an estimate?

  Because it may not represent the whole area
• What should be done if the quadrat throws do not represent the area?

  Increase the number of quadrat throws
• What factor is being investigated in the second part of the practical?

  Light intensity
• How do students measure the effect of light intensity on daisies?

  Using a transect line
• What is the first step in measuring the effect of light intensity?

  Place a tape measure up to the tree
• What tool can be used to measure light intensity?

  A light meter or an app
• What happens to the number of daisies as you move away from the tree?

  It may increase due to higher light intensity
• What abiotic factors might affect the number of daisies besides light intensity?

  Water and minerals from the soil