Activity 9.3 (Form 5 Biology Textbook Exercise and Answer)

Activity 9.3:
To carry out a field study to estimate the population size of plants in the school field

A quadrat measuring 1 m × 1 m, a pen, a note book

1. Identify a plant species X present in the school field.

2. A quadrat measuring 1 m × 1 m is randomly placed in a part of the school field.

3. Calculate the number of species X in the quadrat.

4. Repeat steps 2 and 3 at nine other sites of the field, randomly selected, also for the same plant species.

5. Record the results in a table.

6. Calculate the frequency, density and the coverage percentage of sample species X.


1. State the pattern of species distribution that you have studied. Justify your answer.

2. State the surrounding factors which affect the pattern of population distribution of the species that you have studied.

3. What is the frequency, density and coverage percentage of the species in the school field?

Is the hypothesis accepted? Suggest a suitable conclusion.


1. Random distribution. Organisms are in a free pattern in an area.

2. Temperature, light intensity and humidity

Frequency: 70%
Density: 3 individuals per metre
Coverage percentage: 30%

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