Describe how you could estimate the size of a population of sundews in a small marsh.
- AQA - A-Level Biology - Question 9 - 2019 - Paper 2
Question 9
Describe how you could estimate the size of a population of sundews in a small marsh.
Worked Solution & Example Answer:Describe how you could estimate the size of a population of sundews in a small marsh.
- AQA - A-Level Biology - Question 9 - 2019 - Paper 2
Step 1
Use a grid
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Answer
Begin by dividing the area of the small marsh into a grid. This involves marking the marsh with equal squares or sections, which helps in organizing the sampling process.
Step 2
Take random samples
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Obtain random coordinates within the grid using a calculator, random number table, or software. This allows for unbiased sampling of the sundew population.
Step 3
Count the sundews
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Answer
In each selected quadrat (grid section), count the number of sundews present. This provides data for the estimated density of the plants in each area.
Step 4
Calculate mean abundance
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Answer
Calculate the average number of sundews per quadrat by taking the total count from all quadrats sampled and dividing by the number of quadrats. This yields an estimate of the population density.
Step 5
Calculate total population
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Answer
To estimate the total population size, multiply the average number of sundews per quadrat by the total number of quadrats in the marsh. This gives a comprehensive estimate of the sundew population.
