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






2. 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






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






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






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






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






7. The flow of water in the water table.






8. Consumers which eat both plants and animals.






9. 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.






10. A variety of species living together.






11. 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.






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






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






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






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






16. Consumers which eat decomposing organic material.






17. 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.






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






19. A transitional area between two different ecosystems.






20. Growing only one crop at a time.






21. 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.






22. The rate at which producers create organic material.






23. 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.






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






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






26. An international organization designed to promote free trade between countries.






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






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






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






30. Organisms which eat other organisms.






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






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






33. 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.






34. 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.






35. 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.






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






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






38. 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






39. 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.






40. Precipitation which does not reach the soil but is instead collected by plants.






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






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






43. A type of symbiosis where one species will benefit while the other will be neither benefit or be harmed.






44. 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.






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






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






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






48. Organisms which produce their own food.






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






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