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DSST Environment And Humanity

Subjects : dsst, science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Biomes with less than 10 inches of rain a year. Foliage is scarce in these areas - and remaining plants and animals work hard to conserve the little water they receive.






2. Average expected birth rate for 1 -000 women.






3. An agency created to establish regulations concerning pollutants to protect humans and the environment.






4. The position of an organism on the food chain.






5. The process by which a new species is created. This process generally requires geographic isolation to prevent interbreeding between the newly emerging species and the parent species.






6. An unstable form of oxygen which protects the earth from UV radiation. Although naturally occurring in the stratosphere (upper atmosphere) - in the lower atmosphere this gas acts as a pollutant.






7. Political organizations not affiliated with the government which try to bring about social change.






8. The process of planting trees in between other crops.






9. An international protocol designed to protect the ozone layer by phasing out the production of CFCs and other harmful chemicals.






10. A law designed to locate toxic waste sites - gauge their pollution level - and ensure these sites are taken care of properly.






11. Single-celled organisms which lack a nucleus.






12. The flow of water in the water table.






13. A greenhouse gas. Although it is a natural part of the carbon cycle - the atmospheric concentration of this gas has increased due to the burning of fossil fuels.






14. Species which react quickly to an environmental change and therefore can be used to diagnose a particular ecosystem.






15. Precipitation which does not reach the soil but is instead collected by plants.






16. A type of symbiosis where one species benefit at the expense of the other.






17. An act which set standards for the amount of pollution in water.






18. The loss of water vapor from leaves.






19. Different species living in close contact with each other.






20. A principle that states that two species competing for a single resource cannot coexist. One species will inevitably gain an advantage over the other - causing the looser either to migrate or to become extinct.






21. Surface run-off caused by melted snow.






22. Populations characterized by large size - long lifespan - and few offspring.






23. Condensed water vapor which falls to earth. This comes in many forms - such as rain - snow - ice - and hail.






24. An act which required the EPA to set standards for drinking water.






25. The decomposition of organic nitrogen into inorganic ammonium. This process is also called mineralization.






26. Organisms which consume autotrophs for food.






27. Plants taking in nitrates from the soil.






28. An international protocol designed to stabilize global warming.






29. Consumers which eat decomposing organic material.






30. The crust and upper mantle of the earth.






31. All of the ecosystems on earth.






32. Organisms which create their own food out of inorganic (abiotic) substances.






33. An act which protects certain lands as national parks.






34. The combination of evaporation from the ocean - lakes - and other bodies of water and transpiration - the loss of water from plants.






35. A type of farming where the farmer will grow just enough crops to satisfy his family's needs for the next year.






36. An act created to protect endangered and threatened species.






37. A community of similar living organisms largely affected by the area's climate.






38. A bloom of phytoplankton in a body of water caused by an abnormal increase in nutrients. This process depletes the water's oxygen level - killing off other aquatic organisms.






39. A situation where a layer of warmer air traps lower - cooler air - causing pollution to collect near the ground.






40. A transitional area between two different ecosystems.






41. Evolution in one organism due to change in a related organism.






42. All of the water found on earth.






43. Grasslands with short - widely spaced trees and no canopy - allowing for an unbroken layer of grasses beneath.






44. The process by which pollutants are carried by flowing water - such as a river.






45. Populations characterized by small size - short lifespan - and lots of offspring.






46. The uppermost atmospheric layer. Here satellites orbit the earth.






47. A rainforest in the temperate zone which receives heavy rainfall.






48. Water found in estuaries. This water is a mixture of saltine ocean water and fresh water - usually from a river or stream.






49. The conversion of nitrates into nitrogen gas.






50. A form of management which attempts to satisfy both the needs of humans and those of wildlife in the best way possible for both parties.







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