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 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.






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






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






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






5. Biomes far north in North America - Europe - and Asia which - due to very low temperatures - cannot support tree growth.






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






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






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






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






10. 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.






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






12. 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.






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






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






15. 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






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






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






18. The area between the troposphere and the stratosphere. Here the temperature reverses from decreasing to increasing with altitude.






19. A greenhouse gas. Although it is a natural part of the carbon cycle - the atmospheric concentration of this gas has increased due to the burning of fossil fuels.






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






21. Also called that water cycle - this process describes the cycling of water throughout the environment. The stages of this cycle are evaporation - condensation - transportation - precipitation - infiltration and percolation - and run off.






22. An international protocol designed to stabilize global warming.






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






24. Species which react quickly to an environmental change and therefore can be used to diagnose a particular ecosystem.






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






26. Consumers which eat decomposing organic material.






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






28. The flow of water in the water table.






29. Organisms which consume autotrophs for food.






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






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






32. Organisms which produce their own food.






33. Organisms with a nucleus.






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






35. 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.






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






37. Different species living in close contact with each other.






38. 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






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






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






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






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






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






44. Surface run-off caused by melted snow.






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






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






47. A group of similar organisms capable of interbreeding.






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






49. 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.






50. Consumers which eat both plants and animals.