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






2. Organisms which thrive in high nutrient environments - especially those with plenty of carbon.






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






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






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






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






7. Animals which eat leaves and shoots.






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






9. Organisms which produce their own food.






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






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






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






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






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






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






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






17. All of the ecosystems on earth.






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






19. Animals which eat grass and roots.






20. An extinct hominid species believed to exhibit the first example of full-time bipedalism.






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






22. A layer of gasses surrounding the earth.






23. 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.






24. 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.






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






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






27. Organisms which eat other organisms.






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






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






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






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






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






33. 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.






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






35. 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.






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






37. 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.






38. 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.






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






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






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






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






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






44. Consumers which eat decomposing organic material.






45. 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.






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






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






49. Plants taking in nitrates from the soil.






50. 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.







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