Study of plant population frequency by quadrat method

Materials Requires

Real Lab Procedure

  • In the selected site of study, hammer the nails firmly in the soil without damaging the vegetation.
  • Fix four nails to make a square.
  • Tie each end of the nails using a thread, to make a 1 m X 1 m quadrat.
  • Similarly, make nine more quadrats randomly in the site of study.     
  • Select the plant species for study of the population frequency.
  • Observe the presence of species “A” in the first quadrat and mark it in the table.
  • Similarly, check for the presence of species “A” in other quadrats respectively and record the data in the table.
  • Observe the presence of species “B” in all quadrats and mark it in the table.
  • Repeat the same procedure for species C and record the data in the table.
  • We can calculate the frequency of plant populations by this equation:
  • Percentage Frequency=(Number of sampling units in which the species occurs)/(Total number of sampling units employed for the study)*100


Plant Species Quadrats employed in the study Number of quadrats in which the species is present (N) Percentage Frequency F=N/Q*100
A P P   P     P   P   5 50%
B         P           1 10%
C   P   P   P       P 4 40%

Frequency value indicates the number of times a plant species is present within a given number of sample quadrats.

Simulator Procedure (as performed through the Online Labs)

  • Click on the popup corresponding to each quadrat to enlarge the view.
  • You can select the environment for study from the ‘Select the environment’ drop down list.
  • Observe the presence plant species in the quadrat.
  • Enter 'Y’ in the worksheet if a particular plant species is present or ‘N’ if it is not present.
  • Click on the back button to show normal view of the quadrat.
  • Based on the values entered, the worksheet gives the plant population frequency for each species.
  • You can redo the experiment by clicking on the ‘Reset’ button.

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