Estimation of population size

Diagram below shows three squares of similar size, A1, A2 and A3 showing the coverage of sunflowers in the field of school.

What is the coverage percentage sunflowers in the field?

• 30%

• 40%

• 50%

• 60%

Table below shows the result of an experiment to estimate the number of plant X in 10 quadrats, each measuring 1m x 1m.

Calculate the frequency of plant X.

• 20%

• 40%

• 60%

• 80%

The following information shows the date of an experiment conducted by a scientist to estimate the population size of rats in a paddy field.

* 30 rats were caught and marked on the first day.

*38 rats were caught a week later, 18 were unmarked.

what is the population size of the rats in the paddy field?

• 16

• 27

• 57

• 63

A group of students carry out a project by using six quadrats with size 1m x 1m. the following table shows data obtained.

What is the percentage of species P coverage in this project?

• 1.8%

• 18%

• 30%

• 300%

Table below shows the result of a population study of grasshoppers in a vegetable garden.

Determine the population size of grasshopper in the garden.

• 150

• 250

• 200

• 300

A student prepared a quadrat measuring 1m x 1m to estimate the population of Elodea sp. in a pond. The total surface area of the pond is 100m². The results obtained after placing the quadrat randomly at five different locations are shown in the table below.

What is the population size of Elodea sp. in the pond?

• 145

• 725

• 2900

• 14500