Study the Plant Population Density by Quadrat Method

Aim

To study the plant population density by the quadrant method.

Materials Required

  • Thread
  • Hammer
  • Nails

Procedure

  1. Select a site for the study and hammer the nails on the site without harming the vegetation.
  2. Fix four nails in the form of a square.
  3. Each end of the nail is tied with the help of a thread making a 1m*1m quadrant.
  4. Nine more similar quadrants are made at the site of the study.
  5. The number of individuals of the species A present in the first quadrant are counted and the data is recorded in the table.
  6. The number of individuals of species A in other quadrants are also counted and the data is recorded in the table.
  7. Similarly, count the number of individuals of species B and C present in all the quadrants and record the data in the table.
  8. The density of the plant population is then calculated by the following equation:

Density=Total number of individuals of the species in all sampling units (S)/Total number of sampling units studied (Q).

Observations

Plant Species

Number of individuals in each quadrant

Total number of individuals (S)

Total number of quadrants (Q)

Density (D)=S/Q

I

II

III

IV

V

VI

VII

VIII

IX

X

A

2

0

5

7

10

0

0

0

0

3

27

10

2.7

B

1

0

4

0

8

0

3

0

0

2

20

10

2.0

C

4

0

0

3

0

6

0

0

1

2

19

10

1.9

Conclusion

The population density is the highest for species A and the lowest for species C. The density value is expressed as the number of individuals per unit area.

Also Read: Parts of Plants

 Kingdom Plantae

For more information on Biology Experiments for CBSE Class 12, keep visiting BYJU’S website or download BYJU’S app for further reference.

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