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