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






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






3. All of the water found on earth.






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






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






6. All of the ecosystems on earth.






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






8. Organisms which consume autotrophs for food.






9. A transitional area between two different ecosystems.






10. Animals which eat grass and roots.






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






12. 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






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






14. 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.






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






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






17. 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.






18. 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.






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






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






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






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






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






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






25. A group of similar organisms capable of interbreeding.






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






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






28. An extinct hominid species believed to have the same brain capacity as modern man and use many different weapons.






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






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






31. Organisms which produce their own food.






32. An international protocol designed to stabilize global warming.






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






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






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






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






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






38. A layer of gasses surrounding the earth.






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






40. 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.






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






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






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






44. 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.






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






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






47. Organisms which eat other organisms.






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






49. A type of symbiosis where each species will benefit from interacting with the other.






50. The process of a gas transforming into a liquid.