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






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






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






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






5. The flow of water in the water table.






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






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






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






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






10. Single-celled organisms which lack a nucleus.






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






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






13. 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.






14. Organisms which produce their own food.






15. Organisms with a nucleus.






16. 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.






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






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






19. A UN conference held in Rio de Janeiro. The conference decided to protect biodiversity - reduce pollution emissions and greenhouse gasses - and promote sustainable development.






20. 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.






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






22. 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.






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






24. 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.






25. All of the ecosystems on earth.






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






27. 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.






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






29. The process of planting different plant species right next to each other to maximize one's yield.






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






31. 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.






32. An international protocol designed to stabilize global warming.






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






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






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






36. Animals which eat grass and roots.






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






38. 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.






39. 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.






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






41. 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.






42. All of the water found on earth.






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






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






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






46. The conversion of nitrates into nitrogen gas.






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. Plants taking in nitrates from the soil.






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






50. Organisms which consume autotrophs for food.







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