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






2. A layer of gasses surrounding the earth.






3. Modern man.






4. Animals which eat grass and roots.






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






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






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






8. 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.






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






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






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






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






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. The oxification of ammonia by certain bacterium into nitrite and later into nitrates - which can then be used by plants.






15. Water found in estuaries. This water is a mixture of saltine ocean water and fresh water - usually from a river or stream.






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






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






18. The flow of water in the water table.






19. The rate at which producers create organic material.






20. 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.






21. Consumers which eat both plants and animals.






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






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






24. 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.






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






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






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






28. A type of farming where the farmer will fell and burn down trees to grow crops. After a few years - he will move on and continue the process.






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






30. An act which set standards for the amount of pollution in water.






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






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






33. Growing only one crop at a time.






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






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






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






37. Animals which eat leaves and shoots.






38. Plants taking in nitrates from the soil.






39. Single-celled organisms which lack a nucleus.






40. Organisms which consume autotrophs for food.






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






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






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






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






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






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






47. An American environmentalist who is famous for promoting the ideas of environmental ethics and wildlife management.






48. Surface run-off caused by melted snow.






49. A type of symbiosis where one species will benefit while the other will be neither benefit or be harmed.






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