Test your basic knowledge |

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. Growing more than one crop at a time.






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






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






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






5. Animals which eat leaves and shoots.






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






7. 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.






8. Organisms with a nucleus.






9. A partially enclosed part of the ocean with rivers or streams flowing into it.






10. Organisms which consume autotrophs for food.






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






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






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






14. Biomes with less than 10 inches of rain a year. Foliage is scarce in these areas - and remaining plants and animals work hard to conserve the little water they receive.






15. The biggest atmospheric layer. Without ozone - UV radiation causes ionization and the auroras in this layer.






16. Growing only one crop at a time.






17. Plants taking in nitrates from the soil.






18. All of the ecosystems on earth.






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






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






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






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






23. The crust and upper mantle of the earth.






24. 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.






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






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






27. A group of similar organisms capable of interbreeding.






28. The process by which certain kinds of bacteria convert atmospheric nitrogen gas into ammonia - a form accessible to living creatures.






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






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






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






32. 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.






33. The loss of water vapor from leaves.






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






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






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






37. 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.






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






39. 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.






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






41. 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.






42. All of the water found on earth.






43. Single-celled organisms which lack a nucleus.






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






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






46. A forest found in temperate regions with warm summers - cool winters - and plenty of rainfall. These kinds of forests are characterized by evergreens and deciduous trees.






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






48. Organisms which eat other organisms.






49. Modern man.






50. A variety of species living together.