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 conversion of nitrates into nitrogen gas.






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






3. 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.






4. Organisms with a nucleus.






5. 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.






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






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






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






9. An international protocol designed to stabilize global warming.






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






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






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






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






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






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






16. The rate at which producers create organic material.






17. 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






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






19. Any living thing on earth.






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






21. Consumers which eat both plants and animals.






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






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






24. Single-celled organisms which lack a nucleus.






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






26. All of the ecosystems on earth.






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






28. Plants taking in nitrates from the soil.






29. 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






30. Consumers which eat only other animals.






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






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






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






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






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






37. 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.






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






39. The crust and upper mantle of the earth.






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






41. 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.






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






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






44. Growing only one crop at a time.






45. 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.






46. 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.






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






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






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






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.