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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 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






2. 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.






3. All of the water found on earth.






4. A group of similar organisms capable of interbreeding.






5. 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.






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






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






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






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






10. 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.






11. A transitional area between two different ecosystems.






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






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






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






15. A variety of species living together.






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






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






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






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






20. Modern man.






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






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. Consumers which eat decomposing organic material.






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






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






26. 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.






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






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






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






30. Biomes far north in North America - Europe - and Asia which - due to very low temperatures - cannot support tree growth.






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






32. 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.






33. Consumers which eat only other animals.






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






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






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






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






38. The loss of water vapor from leaves.






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






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






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






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






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






44. 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.






45. Organisms which produce their own food.






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






47. All of the ecosystems on earth.






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






49. Animals which eat grass and roots.






50. The conversion of nitrates into nitrogen gas.