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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 will benefit while the other will be neither benefit or be harmed.






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






3. Condensed water vapor which falls to earth. This comes in many forms - such as rain - snow - ice - and hail.






4. A greenhouse gas. Although it is a natural part of the carbon cycle - the atmospheric concentration of this gas has increased due to the burning of fossil fuels.






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






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






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






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






9. Organisms which thrive in high nutrient environments - especially those with plenty of carbon.






10. The flow of water in the water table.






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






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






13. All members of a species which live in the same area.






14. Plants taking in nitrates from the soil.






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






16. Animals which eat leaves and shoots.






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






18. The crust and upper mantle of the earth.






19. An international protocol designed to stabilize global warming.






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






21. Organisms which eat other organisms.






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






23. An act requiring federal agencies to detail the impact of proposed environmental policies.






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






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






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






27. Growing only one crop at a time.






28. Modern man.






29. 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.






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






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






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






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






34. 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.






35. Consumers which eat both plants and animals.






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






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






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






39. Populations characterized by small size - short lifespan - and lots of offspring.






40. Animals which eat grass and roots.






41. An agency created to establish regulations concerning pollutants to protect humans and the environment.






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






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






44. Organisms which consume autotrophs for food.






45. 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.






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






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






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






49. 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






50. A layer of gasses surrounding the earth.







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