Chat with AIExam 10: Water Resources
The concentration of DDT in a species of phytoplankton is 12 mg DDT/kg phytoplankton. The concentration of DDT in a fish known to exclusively consume that species of phytoplankton is 150 µg DDT/kg fish. This results in a ratio of the DDT concentration in the fish to DDT concentration in the phytoplankton of 0.0125. Is this an example of biomagnification? Explain why or why not.
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VerifiedNo, this is not biomagnification. Biomagnification requires that the organism has a higher tissue concentration of the contaminant than the organism it consumes (i.e., a ratio > 1). Here, the ratio is 0.0125 and 0.0125 < 1, therefore this is not biomagnification.
Explain the sequence of events after the Army Corps of Engineers transformed the Kissimmee River from 1962-1971. What is its current status?
(30) VerifiedIn 1962 the US Army Corps of Engineers began to transform 56 miles of the Kissimmee into a wide, deep, and navigable channel. The goal was to provide development, flood control, and a more consistent navigable channel. These changes produced the unintended effects of compromising the quality of the water, increasing flooding problems, and radically changing in the ecosystem. They are now attempting to reverse the process and return the land to its original state. The ecosystem is slowing being restored.
What is the difference between a direct effect of a pollutant on an organism and an indirect effect? Explain.
(42) VerifiedA pollutant is said to directly affect an organism if the contaminant exerts a toxic action on the organism. For example, the contaminant may actually kill the organism or impair its ability to reproduce. An indirect effect could be when the contaminant impacts another organism on which the organism in question depends. If the contaminant decreases the population of the organism's food, for example, then that organism will be negatively impacted even if it is immune to the direct effects of the contaminant.
Amphibians are particularly sensitive to water pollution because
(33) The amassing of any given substance in a living organism is called
(30) Which of the following would not be an effect of eutrophication?
(46) In response to water shortages, some restaurants do not serve glasses of water with meals. Discuss the efficacy of this policy in terms of water conservation.
(33) The greatest quantity of accessible drinking water is held in
(36) A contaminant is released into a body of water that is toxic to a segment of the aquatic arthropod population. Explain how this could be both a direct biological effect and an indirect biological effect.
(40) A _______ is a chemical that is toxic to some or all forms of life but it is not of biological origin.
(29) When contaminating/polluting substances originate from many diffuse sources and enter a body of water indirectly, it is called _______ pollution.
(26) An emerging pollution problem is from personal care products (antibiotics, medicines, birth control pills, etc.) that are flushed down the toilet or disposed as municipal soil waste. This kind of water pollution would be best called
(27) Many projections suggest that global warming in the future could greatly increase existing water inequities. Explain what this means and why it is a problem.
(31) Which of the following is not an example of how surface water functions to serve humans?
(36) In studying the bioaccumulation of contaminants in aquatic organisms, toxicologists find that it is critical to understand the chemical behavior of contaminants. Why?
(38) Dumping waste cyanide from a manufacturing facility would be considered _______, whereas dumping waste salt (sodium chloride) into a lake would be _______.
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