Estimation of population size

Front

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.

Back

60%

Front

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?

Back

57

Front

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

Back

200

Front

Population size of Elodea sp. in a pond with a total surface area of 100m² using a 1m x 1m quadrat.

Back

2900