7.5 Food production (biology only)

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Question 2
Medium

The biomass of Atlantic cod in a particular marine region has changed over several decades due to fishing activity. Figure 1 shows the estimated biomass of adult cod between 1980 and 2020. A line graph titled 'Figure 1' showing the biomass of adult cod in millions of tonnes from 1980 to 2020. Calculate the percentage decrease in the biomass of adult cod between 1990 and 2010. Use the equation:

percentage decrease=(biomass in 1990−biomass in 2010)biomass in 1990×100 \text{percentage decrease} = \frac{(\text{biomass in 1990} - \text{biomass in 2010})}{\text{biomass in 1990}} \times 100 percentage decrease=biomass in 1990(biomass in 1990−biomass in 2010)​×100

Give your answer to the nearest whole number.

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7.5 Food production (biology only) Questions

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