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






2. The rapid increase of harmful algae in a body of water.






3. Organisms with a nucleus.






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






5. The first atmospheric layer. Most weather and pollution occurs here - and the temperature decreases with altitude.






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






7. The rate at which producers create organic material.






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






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






10. 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.






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






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






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






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






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






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






17. A variety of species living together.






18. An influential book by Rachel Carson which helped begin the environmental movement.






19. A forest near the equator with heavy rainfall and a great diversity of plant and animal life. Although a mere 2% of the earth is covered with these forests - they contain 50-80% of earth's land species.






20. Any living thing on earth.






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






22. An act which established and enforced acceptable levels of air pollution.






23. The second atmospheric layer. The ozone layer is found here - increasing the temperature with altitude.






24. Organisms which produce their own food.






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






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






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






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






29. The spraying of pesticides to keep produce from any injuries or damage.






30. 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.






31. All of the ecosystems on earth.






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






33. The middle atmospheric layer. Meteors burn up after entering this layer.






34. Organisms which consume autotrophs for food.






35. A group of similar organisms capable of interbreeding.






36. 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.






37. 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.






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






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






40. The southern-most continent - of which 98% is ice. This continent includes 70% of the world's fresh water - and 90% of the world's ice. Although the average temperature is -49






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






42. 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.






43. Organisms which eat other organisms.






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






45. 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.






46. 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.






47. Animals which eat grass and roots.






48. A layer of gasses surrounding the earth.






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






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







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