Unit 4 Exam- Water Pollution and Toxicology
Which of the following is a part of risk assessment
Assessing the probability of risik
Which of the following diseases is incorrectly paired with its type of organism
Bacteria- Severe Acute Respiratory Syndrome
Which law sets standards for key water pollutants and requires polluters to get permits limiting what they can discharge in to aquatic systems
Clean Water Act of 1977
Stormwater runoff from the new development into nearby Samel Creek will likely lead to which of the following?
Destruction of fish habitats by high levels of suspended soil..
Which of the following characteristically produces non-point source pollution
Erosion from agricultural land
If all four of the bacteria species shown in the graph are equally likely to contaminate agricultural products at a dose of 102 CFU, regulating which of the following species would have the greatest effect in reducing the likelihood of illness in humans? Salmonella
Salmonella
Many synthetic chemicals, such as PCBs, act as estrogen mimics. In an ecosystem, these persistent chemicals would have the greatest effect on which of the following?
Secondary Consumers
Which of the following best describes an exposure threshold for a toxic chemical
The dose that is tolerable for all test subjects
A local citizen science group is monitoring the water quality of a nearby lake. They gather water samples once a week on Wednesday between the hours of 7 A.M. and 9 A.M. from the same location. One day in August they were unable to sample within that time frame and collected the sample at 3 P.M. How might this modification to the sampling procedure affect the results?
Water sampled later in the day may be warmer and therefore have lower dissolved oxygen levels.
Which potential source of water pollution is considered a point source of pollution
an active oil field
Oxygen sags curve can occur when
bacteria break down biodegradable wastes
Primary sewage treatment is used to remove which of the following from the water
both biodegradable and nonbiodegradable solids
Teratogens
cause mutations
As a water pollutant, excessive heat is more likely to come from what source?
electrical and nuclear power stations
The activity with the health risk most likely to be overestimated by the general public in the United States is
living near a nuclear power plant
the rise of antibiotic resistant pathogens can be attributed to all of the following except
not the reproductive rate
Which of the following water pollutants is incorrectly paired with it source
sediments - unlined landfills
A laboratory study using rats showed a steady increase in negative physiological effects as the concentration of a toxic substance in their food was increased. This suggests that
the dose-response relationship is linear
Some studies have indicated that global amphibian pops are declining and that exposure to herbicides in agricultural runoff implicated the decline.
the herbicides act as endocrine disrupters
Which of the following will be the greatest impact of the development on the local water supply
there will be less recharge of groundwater