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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. Organisms which produce their own food.






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






3. A group of similar organisms capable of interbreeding.






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






5. Modern man.






6. 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.






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






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






9. Animals which eat leaves and shoots.






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






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






12. An international protocol designed to protect the ozone layer by phasing out the production of CFCs and other harmful chemicals.






13. Organisms which eat other organisms.






14. 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.






15. Consumers which eat decomposing organic material.






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






17. A transitional area between two different ecosystems.






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






19. 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






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






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






22. 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.






23. 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.






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






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






26. 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.






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






28. 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.






29. An international protocol designed to stabilize global warming.






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






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






32. A variety of species living together.






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






34. A shubland found primarily in the South-Western United States and Mexico. Fire plays a predominant role in the life-cycle of the plants in this area - the seeds of which will sprout only after a fire.






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






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






37. 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.






38. An act which required the EPA to set standards for drinking water.






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






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






41. A philosophy that extends ethics to non-humans. Under this system - animals - plants - and other aspects of the environment are seen as being deserving of justice and consideration.






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






43. The rate at which producers create organic material.






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






45. A community of species interacting with their nonliving (abiotic) environment.






46. 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.






47. An agency created to establish regulations concerning pollutants to protect humans and the environment.






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






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






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







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