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






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






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






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






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






6. A theory that our current ecological problems are a product of deeper social problems.






7. A layer of gasses surrounding the earth.






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






9. 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






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






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






12. 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.






13. Animals which eat grass and roots.






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






15. Political organizations not affiliated with the government which try to bring about social change.






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






17. The loss of water vapor from leaves.






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






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






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






21. 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.






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






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






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






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






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






27. Consumers which eat decomposing organic material.






28. Growing more than one crop at a time.






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






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






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






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






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






34. Modern man.






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






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






37. Surface run-off caused by melted snow.






38. An extinct hominid species believed to be the last common ancestor between man and apes.






39. Organisms which produce their own food.






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






41. An extinct hominid species believed to have long - ape-like arms; have a brain capacity half that of modern men; and use primitive tools.






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






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






44. The conversion of nitrates into nitrogen gas.






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






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






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






48. The flow of water in the water table.






49. 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.






50. All of the ecosystems on earth.







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