apes 8

According to the graph below, what would be the LD50 for salt solution for radish seeds?

17% NaCl

The diagram below is of a wastewater treatment facility. At which step would large solids be removed from the wastewater?

A (screening)

Which of the following is the most likely route for mercury to enter the food web?

Coal-burning emissions - deposition - ocean - plankton - fishes

At what step in the diagram would wastewater most likely be treated with chlorine or UV light to remove bacteria?

D

Alligators in a Florida lake polluted by high levels of dioxins (chlorinated hydrocarbons) had low testosterone levels and failed to reproduce. Scientists came to the conclusion that the dioxins were acting as which of the following?

Endocrine disruptors

Which of the following U.S. laws contributes to sustainability by governing the tracking and disposal of solid and hazardous waste?

Resource Conservation and Recovery Act (RCRA)

A Environmental Science student wanted to know what would happen if radish seeds were exposed to increasing concentrations of salt solution. The student created 6 different solutions in increasing dosages and exposed 10 seeds for each solution. Each data point represents the percent of seeds that did not germinate (ungerminated) at each concentration. This data represents which of the following?

Threshold dose response

the absorbtion of a substance by an organism at a rate greater than the rate of elimination

bioaccumulation

biomagnification

can biomagnify through the trophic levels of a food web

Chemicals that are resistant to breakdown and have long-lasting harmful effects on the health of wildlife and people are measured by their

persistence

The diagram below best represents

the flow of various nutrients in a forest community