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






2. 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.






3. Organisms which consume autotrophs for food.






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






5. An international convention which created the framework for protecting the ozone layer.






6. Consumers which eat only other animals.






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






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






9. All of the ecosystems on earth.






10. Exceptionally acidic (low pH) rain. This phenomenon is caused mainly by emissions of carbon dioxide - sulfur dioxide - and nitrogen oxide which react with water particles in the air.






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






12. 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.






13. The UN's first major conference on environmental issues.






14. An act created to protect endangered and threatened species.






15. Consumers which eat both plants and animals.






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






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






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






19. The loss of water vapor from leaves.






20. The rate at which producers create organic material.






21. Any living thing on earth.






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






23. 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.






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






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






26. 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.






27. A UN conference held in Rio de Janeiro. The conference decided to protect biodiversity - reduce pollution emissions and greenhouse gasses - and promote sustainable development.






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






29. 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.






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






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






32. The crust and upper mantle of the earth.






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






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






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






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






38. Single-celled organisms which lack a nucleus.






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






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






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






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






43. Animals which eat leaves and shoots.






44. Plants taking in nitrates from the soil.






45. The conversion of nitrates into nitrogen gas.






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






47. An act which required the EPA to set standards for drinking water.






48. A variety of species living together.






49. The flow of water in the water table.






50. A layer of gasses surrounding the earth.






Can you answer 50 questions in 15 minutes?



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