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. 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.






2. Modern man.






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






4. A community of similar living organisms largely affected by the area's climate.






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






6. Organisms which consume autotrophs for food.






7. A layer of gasses surrounding the earth.






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






9. A theory that our current ecological problems are a product of deeper social problems.






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






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






12. 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






13. The flow of water in the water table.






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






15. Any living thing on earth.






16. 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.






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






18. The loss of water vapor from leaves.






19. The process by which certain kinds of bacteria convert atmospheric nitrogen gas into ammonia - a form accessible to living creatures.






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






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






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






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






24. The rate at which producers create organic material.






25. Growing more than one crop at a time.






26. The decomposition of organic nitrogen into inorganic ammonium. This process is also called mineralization.






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






28. 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.






29. Plants taking in nitrates from the soil.






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






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






32. 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.






33. An international protocol designed to stabilize global warming.






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






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






36. An influential book by Rachel Carson which helped begin the environmental movement.






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






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






39. 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.






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






41. Organisms which produce their own food.






42. All of the water found on earth.






43. 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.






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






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






46. Excess water which cannot be infiltrated into the soil and instead flows along the ground.






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






48. The process by which a new species is created. This process generally requires geographic isolation to prevent interbreeding between the newly emerging species and the parent species.






49. A situation where a layer of warmer air traps lower - cooler air - causing pollution to collect near the ground.






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