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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 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






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






3. The conversion of nitrates into nitrogen gas.






4. A forest found in temperate regions with warm summers - cool winters - and plenty of rainfall. These kinds of forests are characterized by evergreens and deciduous trees.






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






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






7. 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.






8. Organisms with a nucleus.






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






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






11. 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.






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






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






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






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






16. The amount of pests needed before spraying pesticides is economical.






17. Animals which eat leaves and shoots.






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






19. 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.






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






21. Surface run-off caused by melted snow.






22. Growing more than one crop at a time.






23. Modern man.






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






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






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






27. The biggest atmospheric layer. Without ozone - UV radiation causes ionization and the auroras in this layer.






28. The process by which the sun's energy converts liquid water to water vapor in the atmosphere.






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






30. Plants taking in nitrates from the soil.






31. An American environmentalist who is famous for promoting the ideas of environmental ethics and wildlife management.






32. The study of the interaction between organisms and their environment.






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






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






35. The amount of variation among organisms living in a particular ecosystem. The loss of this key characteristic leads to a reduction in ecosystem efficiency and the ability of species to adapt to new situations.






36. Consumers which eat decomposing organic material.






37. Any living thing on earth.






38. Also called that water cycle - this process describes the cycling of water throughout the environment. The stages of this cycle are evaporation - condensation - transportation - precipitation - infiltration and percolation - and run off.






39. All of the water found on earth.






40. The loss of water vapor from leaves.






41. 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.






42. A type of farming where the farmer will grow crops both to fulfill his family's needs for the next year and to sell on the market.






43. Excess water which cannot be infiltrated into the soil and instead flows along the ground.






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






45. Biomes far north in North America - Europe - and Asia which - due to very low temperatures - cannot support tree growth.






46. An extinct hominid species believed to exhibit the first example of full-time bipedalism.






47. Organisms which consume autotrophs for food.






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






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






50. Consumers which eat both plants and animals.