Test your basic knowledge |

DSST Environment And Humanity

Subjects : dsst, science
  • Answer 50 questions in 15 minutes.
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  • 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 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.

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

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

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

5. 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.

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

7. The process by which a new species is created. This process generally requires geographic isolation to prevent interbreeding between the newly emerging species and the parent species.

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

9. A layer of gasses surrounding the earth.

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

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

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

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

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

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

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

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

18. Consumers which eat decomposing organic material.

19. All of the ecosystems on earth.

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

21. 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.

22. The flow of water in the water table.

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

24. Any living thing on earth.

25. Organisms which eat other organisms.

26. The crust and upper mantle of the earth.

27. 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.

28. Consumers which eat both plants and animals.

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

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

31. Organisms which consume autotrophs for food.

32. Surface run-off caused by melted snow.

33. Average expected birth rate for 1 -000 women.

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

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

36. All of the water found on earth.

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

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

39. The process of surface water entering the soil. This ensures that plants have adequate access to water.

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

41. 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.

42. Plants taking in nitrates from the soil.

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

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

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

46. 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

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

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

49. Organisms which produce their own food.

50. The cloudiness of a liquid due to small suspended particles.