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






2. 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






3. 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.






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






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






6. Integrating rows of trees alongside crops to provide mulch and shade - retain water in the soil - and promote sustainable land use.






7. Growing more than one crop at a time.






8. Populations characterized by large size - long lifespan - and few offspring.






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






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






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






12. A variety of species living together.






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






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






15. 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.






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






17. All of the water found on earth.






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






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






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






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






22. A group of similar organisms capable of interbreeding.






23. A layer of gasses surrounding the earth.






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






25. Consumers which eat decomposing organic material.






26. 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.






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






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






29. Animals which eat grass and roots.






30. Consumers which eat only other animals.






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






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






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






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






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






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






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






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






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






40. 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.






41. 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.






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






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






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






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






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






47. Organisms with a nucleus.






48. The second atmospheric layer. The ozone layer is found here - increasing the temperature with altitude.






49. 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.






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