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Question 12CompleteMarked out of 2.00Flag questionTipsQuestion textIn a freshwater lake ecosystem, there is a chain of organisms consisting of algae, zooplankton, small fish, and large predatory fish. The lake has been contaminated with a toxic substance that biomagnifies in the food chain. The concentration of the toxic substance in water is initially measured at 2 parts per million (ppm). Each trophic level accumulates 10% of the toxic substance from the previous level. Calculate the concentration (PPM) of the toxic substance in Large predatory fish.

Question

Question 12CompleteMarked out of 2.00Flag questionTipsQuestion textIn a freshwater lake ecosystem, there is a chain of organisms consisting of algae, zooplankton, small fish, and large predatory fish. The lake has been contaminated with a toxic substance that biomagnifies in the food chain. The concentration of the toxic substance in water is initially measured at 2 parts per million (ppm). Each trophic level accumulates 10% of the toxic substance from the previous level. Calculate the concentration (PPM) of the toxic substance in Large predatory fish.

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Solution

To calculate the concentration of the toxic substance in large predatory fish, we need to follow the food chain and apply the 10% accumulation rule at each trophic level.

  1. Algae: The algae, being the first level in the food chain, will have the same concentration of the toxic substance as the water, which is 2 ppm.

  2. Zooplankton: The zooplankton, which feed on the algae, will accumulate 10% of the toxic substance from the algae. So, the concentration in zooplankton will be 10% of 2 ppm, which is 0.2 ppm.

  3. Small fish: The small fish, which feed on the zooplankton, will accumulate 10% of the toxic substance from the zooplankton. So, the concentration in small fish will be 10% of 0.2 ppm, which is 0.02 ppm.

  4. Large predatory fish: The large predatory fish, which feed on the small fish, will accumulate 10% of the toxic substance from the small fish. So, the concentration in large predatory fish will be 10% of 0.02 ppm, which is 0.002 ppm.

So, the concentration of the toxic substance in large predatory fish is 0.002 ppm.

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