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






2. A transitional area between two different ecosystems.






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






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






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






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






7. Single-celled organisms which lack a nucleus.






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






9. 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






10. All of the water found on earth.






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






12. 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.






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






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






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






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






17. 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.






18. Populations characterized by small size - short lifespan - and lots of offspring.






19. A group of similar organisms capable of interbreeding.






20. Organisms which eat other organisms.






21. Growing only one crop at a time.






22. Animals which eat grass and roots.






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






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






25. 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.






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






27. All of the ecosystems on earth.






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






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






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






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






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






33. 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.






34. 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.






35. Political organizations not affiliated with the government which try to bring about social change.






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






37. Surface run-off caused by melted snow.






38. An international protocol designed to stabilize global warming.






39. Organisms which produce their own food.






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






41. Modern man.






42. 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.






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






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






45. An agency created to establish regulations concerning pollutants to protect humans and the environment.






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






47. 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.






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






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






50. 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.







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