Question

Biology practical 2 study of plant population with answer

Answer 1

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

Plant Species Quadrats employed in the study Number of quadrats in which the species is present (N) Percentage Frequency F=N/Q*100

 I II III IV V VI VII VIII IX X    

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