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DSST Environment And Humanity

Subjects : dsst, science
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. 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.

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

4. Modern man.

5. Species which react quickly to an environmental change and therefore can be used to diagnose a particular ecosystem.

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

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

8. Growing more than one crop at a time.

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

10. 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.

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

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

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

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

15. 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

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

17. The conversion of nitrates into nitrogen gas.

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

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

20. Organisms which eat other organisms.

21. 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.

22. Growing only one crop at a time.

23. A group of similar organisms capable of interbreeding.

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

25. 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.

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

27. A type of farming where the farmer will grow crops both to fulfill his family's needs for the next year and to sell on the market.

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

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

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

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

32. A transitional area between two different ecosystems.

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

34. 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

35. 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.

36. A type of symbiosis where one species will benefit while the other will be neither benefit or be harmed.

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

38. The crust and upper mantle of the earth.

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

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

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

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

43. A layer of gasses surrounding the earth.

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

45. 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.

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

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

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

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

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