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. Organisms which create their own food out of inorganic (abiotic) substances.






2. The crust and upper mantle of the earth.






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






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






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






6. 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.






7. The position of an organism on the food chain.






8. A community of similar living organisms largely affected by the area's climate.






9. A group of similar organisms capable of interbreeding.






10. The loss of water vapor from leaves.






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






12. 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.






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






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






15. Animals which eat grass and roots.






16. 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.






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






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






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






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






21. 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.






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






23. Growing only one crop at a time.






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






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






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






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






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






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






30. 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.






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






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






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






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






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






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






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






38. An international protocol designed to stabilize global warming.






39. Consumers which eat both plants and animals.






40. Organisms with a nucleus.






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






42. Single-celled organisms which lack a nucleus.






43. The rapid increase of harmful algae in a body of water.






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






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






46. A variety of species living together.






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






48. The conversion of nitrates into nitrogen gas.






49. Any living thing on earth.






50. 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.