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Test your basic knowledge |

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. Exceptionally acidic (low pH) rain. This phenomenon is caused mainly by emissions of carbon dioxide - sulfur dioxide - and nitrogen oxide which react with water particles in the air.






2. A layer of gasses surrounding the earth.






3. All of the water found on earth.






4. The conversion of nitrates into nitrogen gas.






5. The cloudiness of a liquid due to small suspended particles.






6. Organisms which eat other organisms.






7. An extinct hominid species believed to have the same brain capacity as modern man and use many different weapons.






8. 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.






9. The process of surface water entering the soil. This ensures that plants have adequate access to water.






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






11. Single-celled organisms which lack a nucleus.






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






13. The process by which certain kinds of bacteria convert atmospheric nitrogen gas into ammonia - a form accessible to living creatures.






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






15. A philosophy that extends ethics to non-humans. Under this system - animals - plants - and other aspects of the environment are seen as being deserving of justice and consideration.






16. 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.






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






18. Areas with only enough rainfall for grasses to grow. As a result - most animals are grazers - such as buffalo.






19. A variety of species living together.






20. Any living thing on earth.






21. All members of a species which live in the same area.






22. Integrating rows of trees alongside crops to provide mulch and shade - retain water in the soil - and promote sustainable land use.






23. Plants taking in nitrates from the soil.






24. An extinct hominid species with near the same brain capacity as modern man believed to use fire and stone tools - live a hunter/gatherer lifestyle - and speak a language.






25. The process of a gas transforming into a liquid.






26. A partially enclosed part of the ocean with rivers or streams flowing into it.






27. The place of an organism in an ecosystem - such as what it eats and how it interacts with other organisms.






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






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






30. A group of similar organisms capable of interbreeding.






31. A type of symbiosis where one species will benefit while the other will be neither benefit or be harmed.






32. A community of species interacting with their nonliving (abiotic) environment.






33. A shubland found primarily in the South-Western United States and Mexico. Fire plays a predominant role in the life-cycle of the plants in this area - the seeds of which will sprout only after a fire.






34. A UN conference that addressed the growing population problem.






35. The coexistence of two species using the same resource where the two will use the resource in different ways.






36. Organisms which consume autotrophs for food.






37. Animals which eat grass and roots.






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






39. Growing more than one crop at a time.






40. Organisms which produce their own food.






41. Modern man.






42. Consumers which eat decomposing organic material.






43. Organisms with a nucleus.






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






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






46. The spraying of pesticides to prevent a pest problem before it happens.






47. Growing only one crop at a time.






48. The infiltration of harmful chemicals - particles - or biological matter into the atmosphere which endanger living organisms. Pollutants include sulfur and nitrogen oxides - ammonia - and chlorofluorocarbons. Although there are natural sources for th






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






50. An especially potent greenhouse gas emitted during production and transportation of fossil fuels - decomposition of organic matter - and herds of livestock.






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