7.4 Trophic levels in an ecosystem (biology only)

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Question 16
Medium

Figure 1 shows how the biomass of adult cod in the North Sea has changed between 1980 and 2020.

A line graph titled 'Figure 1: Biomass of adult cod'. The y-axis is labeled 'Biomass of adult cod in thousands of tonnes' and ranges from 0.0 to 5.0 with grid lines every 0.1 units. The x-axis is labeled 'Year' and ranges from 1980 to 2020 with grid lines every 1 year. The line plot shows the following key coordinates: in 1980 the value is 4.8; in 1985 the value is 4.4; in 1990 the value is 3.0; in 1995 the value is 3.6; in 2005 the value is 0.8; in 2010 the value is 1.5; in 2015 the value is 1.1; and in 2020 the value is 2.2.

Calculate the percentage decrease in the biomass of cod between 1985 and 2005.

Give your answer to the nearest whole number.

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7.4 Trophic levels in an ecosystem (biology only) Questions

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