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 act which protects certain lands as national parks.






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






3. 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.






4. Any living thing on earth.






5. Animals which eat grass and roots.






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






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






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






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






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






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






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






13. Growing only one crop at a time.






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






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






16. Consumers which eat both plants and animals.






17. Single-celled organisms which lack a nucleus.






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






19. The southern-most continent - of which 98% is ice. This continent includes 70% of the world's fresh water - and 90% of the world's ice. Although the average temperature is -49






20. Modern man.






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






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






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






24. 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.






25. The process of surface water entering the soil. This ensures that plants have adequate access to water.






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






27. 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.






28. Surface run-off caused by melted snow.






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






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






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






32. All of the ecosystems on earth.






33. 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.






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






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






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






37. A group of similar organisms capable of interbreeding.






38. The loss of water vapor from leaves.






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






40. Consumers which eat decomposing organic material.






41. The conversion of nitrates into nitrogen gas.






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






43. A layer of gasses surrounding the earth.






44. The rate at which producers create organic material.






45. 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.






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






47. 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.






48. The process by which the sun's energy converts liquid water to water vapor in the atmosphere.






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






50. Organisms which produce their own food.