In 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.a.0.02b.0.002c.0.2d.0.0002
Question
In 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.a.0.02b.0.002c.0.2d.0.0002
Solution
To calculate the concentration of the toxic substance in the large predatory fish, we need to follow the food chain and apply the 10% accumulation at each level.
-
Algae: The algae are the first level in the food chain and they are directly in the water. So, they will have the same concentration as the water, which is 2 ppm.
-
Zooplankton: The zooplankton eat the algae and accumulate 10% of the toxic substance from them. So, the concentration in the zooplankton will be 10% of 2 ppm, which is 0.2 ppm.
-
Small fish: The small fish eat the zooplankton and accumulate 10% of the toxic substance from them. So, the concentration in the small fish will be 10% of 0.2 ppm, which is 0.02 ppm.
-
Large predatory fish: The large predatory fish eat the small fish and accumulate 10% of the toxic substance from them. So, the concentration in the large predatory fish will be 10% of 0.02 ppm, which is 0.002 ppm.
So, the correct answer is b. 0.002 ppm.
Similar Questions
In a pond ecosystem, DDT (dichlorodiphenyltrichloroethane) concentrations are measured as follows:Concentration of DDT in water: 0.002 ppm (parts per million), Concentration of DDT in plankton: 0.01 ppm, Concentration of DDT in small fish: 0.1 ppm. Assuming a biomagnification factor of 10, calculate the expected concentration of DDT in large fish in the pond.a.0.1 PPMb.0.001 PPMc.1.0 PPMd.10.0 PPM
A sample of drinking water was found to be severely contaminated with chloroform (CHCl3), supposed to be a carcinogen. The level of contamination was 15 ppm (by mass).(i) express this in percent by mass.(ii) determine the molality of chloroform in the water sample.
A geochemist measures the concentration of salt dissolved in Lake Parsons and finds a concentration of 47.·gL−1. The geochemist also measures the concentration of salt in several nearby non-isolated lakes, and finds an average concentration of 5.89·gL−1.Assuming the salt concentration in Lake Parsons before it became isolated was equal to the average salt concentration in nearby non-isolated lakes, calculate the percentage of Lake Parsons which has evaporated since it became isolated.Round each of your answers to 2 significant digits.
Calculate concentration in ppb of 1500. mL water containing 0.000300 g Lead ion.Group of answer choices500. ppm5.00 x 10^6 ppb200. ppb2.00 x 10^-7 ppb
If a sample of water contains an abundance of dragonfly nymphs and no stonefly nymphs, then the phosphate level of the water most likely falls within what range?
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.