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






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






3. A greenhouse gas which also plays a key role in regulating ozone levels.






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






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






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






7. Organisms which eat other organisms.






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






9. 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.






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






11. 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.






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






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






14. The process of a gas transforming into a liquid.






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






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






17. Plants taking in nitrates from the soil.






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






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






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






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






22. 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






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






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






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






26. A community of species interacting with their nonliving (abiotic) environment.






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






28. Organisms which produce their own food.






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






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






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






32. A type of farming where the farmer will grow just enough crops to satisfy his family's needs for the next year.






33. A variety of species living together.






34. A transitional area between two different ecosystems.






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






36. Animals which eat grass and roots.






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






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






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






40. 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.






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






42. 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.






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






44. An act which required the EPA to set standards for drinking water.






45. Consumers which eat decomposing organic material.






46. A group of similar organisms capable of interbreeding.






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






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






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. 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







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