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






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






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






4. A transitional area between two different ecosystems.






5. Consumers which eat only other animals.






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






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






8. The loss of water vapor from leaves.






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






10. 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.






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






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






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






14. 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.






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






16. 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.






17. An act which protects certain lands as national parks.






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






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






20. 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.






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






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






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






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






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






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






27. All of the water found on earth.






28. Plants taking in nitrates from the soil.






29. Organisms with a nucleus.






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






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






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






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






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






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






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






37. Organisms which produce their own food.






38. The conversion of nitrates into nitrogen gas.






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






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






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






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






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






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






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






46. 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.






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






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






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






50. Consumers which eat decomposing organic material.