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. 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.






2. The conversion of nitrates into nitrogen gas.






3. Single-celled organisms which lack a nucleus.






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






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






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






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






8. A layer of gasses surrounding the earth.






9. 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.






10. 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.






11. The study of the interaction between organisms and their environment.






12. Organisms with a nucleus.






13. A law designed to locate toxic waste sites - gauge their pollution level - and ensure these sites are taken care of properly.






14. 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.






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






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






17. The rate at which producers create organic material.






18. The crust and upper mantle of the earth.






19. 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.






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






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






22. An act requiring federal agencies to detail the impact of proposed environmental policies.






23. Consumers which eat only other animals.






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






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






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






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






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






29. The loss of water vapor from leaves.






30. The flow of water in the water table.






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






32. A group of similar organisms capable of interbreeding.






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






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






35. 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.






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






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






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






39. A variety of species living together.






40. Modern man.






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






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






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






44. All of the water found on earth.






45. 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.






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






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






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






49. Surface run-off caused by melted snow.






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