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






2. The process of planting different plant species right next to each other to maximize one's yield.






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






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






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






6. The place of an organism in an ecosystem - such as what it eats and how it interacts with other organisms.






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






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






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






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






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






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






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






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






15. Consumers which eat only other animals.






16. 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.






17. Consumers which eat decomposing organic material.






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






19. All of the water found on earth.






20. Consumers which eat both plants and animals.






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






22. Evolution in one organism due to change in a related organism.






23. The process of planting trees in between other crops.






24. 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.






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






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






27. A layer of gasses surrounding the earth.






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






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






31. 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.






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






33. An international organization designed to promote free trade between countries.






34. A group of similar organisms capable of interbreeding.






35. An act requiring federal agencies to detail the impact of proposed environmental policies.






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






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






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






39. Organisms which consume autotrophs for food.






40. 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.






41. Modern man.






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






43. 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.






44. 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.






45. Single-celled organisms which lack a nucleus.






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






47. A variety of species living together.






48. Animals which eat grass and roots.






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






50. Any living thing on earth.







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