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. 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.






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






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






4. An act created to protect endangered and threatened species.






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






6. Growing more than one crop at a time.






7. Consumers which eat only other animals.






8. All of the water found on earth.






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






10. Organisms which consume autotrophs for food.






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






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






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






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






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






16. Modern man.






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






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






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






20. The conversion of nitrates into nitrogen gas.






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






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






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






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






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






26. 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.






27. A group of similar organisms capable of interbreeding.






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






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






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






31. Populations characterized by small size - short lifespan - and lots of offspring.






32. Animals which eat grass and roots.






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






34. Consumers which eat decomposing organic material.






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






36. Grasslands with short - widely spaced trees and no canopy - allowing for an unbroken layer of grasses beneath.






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






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






39. All of the ecosystems on earth.






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






41. Organisms which produce their own food.






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






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






44. Surface run-off caused by melted snow.






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






46. 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.






47. Consumers which eat both plants and animals.






48. Organisms with a nucleus.






49. 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






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