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






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






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






4. Organisms with a nucleus.






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






6. An especially potent greenhouse gas emitted during production and transportation of fossil fuels - decomposition of organic matter - and herds of livestock.






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






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






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






10. 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.






11. 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.






12. An international protocol designed to stabilize global warming.






13. The rate at which producers create organic material.






14. All of the water found on earth.






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






16. Any living thing on earth.






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






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






19. 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.






20. 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.






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






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






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






24. Growing more than one crop at a time.






25. 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.






26. The infiltration of harmful chemicals - particles - or biological matter into the atmosphere which endanger living organisms. Pollutants include sulfur and nitrogen oxides - ammonia - and chlorofluorocarbons. Although there are natural sources for th






27. The combination of evaporation from the ocean - lakes - and other bodies of water and transpiration - the loss of water from plants.






28. A layer of gasses surrounding the earth.






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






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






31. Areas with only enough rainfall for grasses to grow. As a result - most animals are grazers - such as buffalo.






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






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






34. Consumers which eat only other animals.






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






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






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






38. 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.






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






40. Modern man.






41. 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.






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






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






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






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






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






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






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






49. The loss of water vapor from leaves.






50. A variety of species living together.