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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. Consumers which eat decomposing organic material.






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






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






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






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






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






7. 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.






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






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






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






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






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






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






14. An influential book by Rachel Carson which helped begin the environmental movement.






15. Animals which eat leaves and shoots.






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






17. The middle atmospheric layer. Meteors burn up after entering this layer.






18. Growing only one crop at a time.






19. All of the water found on earth.






20. An extinct hominid species believed to be the last common ancestor between man and apes.






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






22. Single-celled organisms which lack a nucleus.






23. The flow of water in the water table.






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






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






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






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






28. 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.






29. 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.






30. Areas with only enough rainfall for grasses to grow. As a result - most animals are grazers - such as buffalo.






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






32. A UN conference that addressed the growing population problem.






33. 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.






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






35. Any living thing on earth.






36. Species which serve key roles in an ecosystem. The absence of these important organisms is detrimental to the surrounding area.






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






38. 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.






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






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






41. Modern man.






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






43. 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.






44. Integrating rows of trees alongside crops to provide mulch and shade - retain water in the soil - and promote sustainable land use.






45. An act which protects certain lands as national parks.






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






47. 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.






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






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






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







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