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
