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






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






3. An extinct hominid species with near the same brain capacity as modern man believed to use fire and stone tools - live a hunter/gatherer lifestyle - and speak a language.






4. A transitional area between two different ecosystems.






5. The rapid increase of harmful algae in a body of water.






6. 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.






7. The second atmospheric layer. The ozone layer is found here - increasing the temperature with altitude.






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






9. The conversion of nitrates into nitrogen gas.






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






11. An extinct hominid species believed to have long - ape-like arms; have a brain capacity half that of modern men; and use primitive tools.






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






13. 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.






14. 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.






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






16. Growing only one crop at a time.






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






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






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






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






21. An extinct hominid species believed to be the last common ancestor between man and apes.






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






23. The flow of water in the water table.






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






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






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






27. Consumers which eat both plants and animals.






28. 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.






29. Consumers which eat only other animals.






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






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






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






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






34. A layer of gasses surrounding the earth.






35. Single-celled organisms which lack a nucleus.






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






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






38. Organisms which eat other organisms.






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






40. Modern man.






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






42. An international protocol designed to stabilize global warming.






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






44. 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.






45. 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.






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






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






48. 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.






49. The coexistence of two species using the same resource where the two will use the resource in different ways.






50. 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.