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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. Consumers which eat both plants and animals.






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






3. Plants taking in nitrates from the soil.






4. 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






5. A type of farming where the farmer will fell and burn down trees to grow crops. After a few years - he will move on and continue the process.






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






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






8. Precipitation which does not reach the soil but is instead collected by plants.






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






10. 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.






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






12. A forest characterized by clearly differentiated seasons - such as the trees loosing leaves in the fall and heavy snowfall in the winter.






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






14. Animals which eat leaves and shoots.






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






16. An international protocol designed to protect the ozone layer by phasing out the production of CFCs and other harmful chemicals.






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






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






19. Organisms which produce their own food.






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






21. Species which serve key roles in an ecosystem. The absence of these important organisms is detrimental to the surrounding area.






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






23. 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.






24. 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.






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






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






27. Single-celled organisms which lack a nucleus.






28. All of the water found on earth.






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






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






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






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






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






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






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






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






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






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. A situation where a layer of warmer air traps lower - cooler air - causing pollution to collect near the ground.






40. The loss of water vapor from leaves.






41. A principle that states that two species competing for a single resource cannot coexist. One species will inevitably gain an advantage over the other - causing the looser either to migrate or to become extinct.






42. Consumers which eat decomposing organic material.






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






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






45. An act which called for the careful examination of new chemicals to ensure they are safe for their intended uses.






46. Growing only one crop at a time.






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






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






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






50. 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.







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