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. Animals which eat grass and roots.






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






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






4. 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.






5. Consumers which eat both plants and animals.






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






7. 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.






8. 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.






9. Growing only one crop at a time.






10. The loss of water vapor from leaves.






11. 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.






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






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






14. 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.






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






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






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






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






19. Organisms which produce their own food.






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






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






22. The process by which pollutants are carried by flowing water - such as a river.






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






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






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






26. A layer of gasses surrounding the earth.






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






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






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






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






31. Consumers which eat decomposing organic material.






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






33. 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.






34. A rainforest in the temperate zone which receives heavy rainfall.






35. A variety of species living together.






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






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






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






39. Organisms with a nucleus.






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






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






42. Animals which eat leaves and shoots.






43. 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






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






45. The crust and upper mantle of the earth.






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






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






48. 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.






49. Consumers which eat only other animals.






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