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






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






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






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






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






6. A group of similar organisms capable of interbreeding.






7. Organisms which produce their own food.






8. A layer of gasses surrounding the earth.






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






10. 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.






11. The loss of water vapor from leaves.






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






13. Single-celled organisms which lack a nucleus.






14. The process of a substance passing directly from the solid phase to the gaseous phase - and vice versa.






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






16. Surface run-off caused by melted snow.






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






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






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






20. 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






21. An international convention which created the framework for protecting the ozone layer.






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






23. Organisms which thrive in high nutrient environments - especially those with plenty of carbon.






24. Organisms which thrive in low nutrient environments and usually have slow growth rates.






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






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






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






28. The cycling and reusing of elements and molecules (such as water - nitrogen - and phosphorus) that are essential to life.






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






30. 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.






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






32. An international organization designed to promote free trade between countries.






33. The oxification of ammonia by certain bacterium into nitrite and later into nitrates - which can then be used by plants.






34. An act requiring federal agencies to detail the impact of proposed environmental policies.






35. The UN's first major conference on environmental issues.






36. Consumers which eat decomposing organic material.






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






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






39. The area between the troposphere and the stratosphere. Here the temperature reverses from decreasing to increasing with altitude.






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






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






42. All of the water found on earth.






43. Forests found in the northern regions of North America - Europe - and Asia characterized by freezing winters and warmer summers. These forests lie just below the tree line.






44. Consumers which eat both plants and animals.






45. Animals which eat leaves and shoots.






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






47. 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






48. The crust and upper mantle of the earth.






49. Modern man.






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