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

Observations

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.