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






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






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






4. Any living thing on earth.






5. Organisms which consume autotrophs for food.






6. Modern man.






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






8. All of the water found on earth.






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






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






11. A variety of species living together.






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






14. The rate at which producers create organic material.






15. 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.






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






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






18. The conversion of nitrates into nitrogen gas.






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






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






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






22. The combination of evaporation from the ocean - lakes - and other bodies of water and transpiration - the loss of water from plants.






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






24. Animals which eat grass and roots.






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






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






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






28. Organisms which eat other organisms.






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






30. A group of similar organisms capable of interbreeding.






31. 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.






32. Single-celled organisms which lack a nucleus.






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






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






35. The crust and upper mantle of the earth.






36. 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.






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






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






39. Organisms which produce their own food.






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






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






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






43. The flow of water in the water table.






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






45. Different species living in close contact with each other.






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






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






48. Surface run-off caused by melted snow.






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






50. Plants taking in nitrates from the soil.