APES unit 8

steps of the purification and treatment of municipal wastewater

water is passed through a screen, a floccing agent is added, suspended particles clump and settle out, pathogenic organisms are killed

a local group had to sample in a differnt time frame how might this affect results

water sampled later in the day might be warmer having lower oxygen levels

Large objects, such as sticks and rocks, are screened out and removed during this process.

A, wastewater in

this process uses chlorine uV radation or ozone

D, release to environment

which explanins why top predators can haveup to 600 times as much of presistant organicpollutant as their prey

POP accumulate in the body fat of living organisms

regulations that deals with the disposal of hazardius materials

RCRA

All of the following are used to deal with the side effects of euthophication except

adding nitrates

Eutrophication results in the death of trout and other fish as a result of

asphyxiation from lack of oxygen

which of the following human health issues is linked to exposure to polluntant released during the incineration of plastic waste

asthma

Some toxic compounds are ingested and retained in the tissues. These pollutants pose special risks to humans and other organisms high on the food chain because of which process?

biomagnificatio

describes the action of an endocrine disruptor

blocks the receptor protien binding site of a hormone

this process results inthe biological breakdown of most of the organic matter in sewage

c, air activate sludge

which of the following best explains why DDT has been found in penguin eggs

chemicals used in one region of earth can circulate in the biosphere

effects the intestines and spread through contamination of water and food

cholera

route for mercury entering the oceanic food webs

coal burning, deposition, oceam, plankton, fish

which of thr following federal laws specifically deals with the cleanup of abandoned hazordus waste sites

comprhensive environmental rsponsibility compensation and liability act

which statements about ozone is true

contact with ozonce can be injurus, ozone absorbs some wavelength and ultraviolet

An ecologist examining several different ponds discovers that in one pond all the frogs are female. Which of the following most likely led to the all-female population of frogs?

endocrine disruptor

factors that increase the spread of infectous disese except

exposure to nuerotoxins

LD-50 dosage level for rat is determined to be 250 milgrams which of thr following is the best prediction regarding the consequence of recciving this dosage

five hundred out every 1000 rats would die

all of the following are hazardus execpt

food scraps

describes a supporting ecological service provided by wetlands

habitat for wide variety of organisms

defining characteristics of wetlands

hydrology, soil type, species composistion

west nile virus is acquired by

infected mosquitoes

which is the primary method of waste disposal

landfilling

which describes why macroinvertebrate sampling can be used to asess the overall health of the stream

macroinvertebrates live inn an aquatic ecosyems for long enough to show the cronic effects of polluntants

poses a risk to humans who eat lots of fish

mercury

less LD50

more toxic

which is the greatest component by weight of municapal solid waste

paper

Of the following strategies to decrease the landfill volume of packaging material from food and other consumerproducts the most energy efficent is

promoting the use of reusable containers

which of the following laws gavethe EPA the authority to control hazardous waste from cradel to grave

resource conservation recovery act

waste from which of the following is a nonprofit source pollution

runoff from agriculture

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 is the best description of bioaccumulation

the absorption of a substance by an organism at a rate greater than the rate of elemination

A laboratory study using rats showed a steady increase iin physical effects as the concentration of a toxic substance in their food. this suggests

the dose responsive relationship is linear

The water used in this type of power plant is often released back into a reservoir. What effects could this released water have on the reservoir?

the temperature of the relaesed water causes a decrese in the amount of dissolved oxygen in the revoir

this pathogen infects the respirtory system and can spread through the air

tubercolosis