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. Organisms which produce their own food.






2. Surface run-off caused by melted snow.






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






4. The position of an organism on the food chain.






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






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






7. A rainforest in the temperate zone which receives heavy rainfall.






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






9. Organisms which consume autotrophs for food.






10. 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.






11. 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.






12. Consumers which eat only other animals.






13. The first atmospheric layer. Most weather and pollution occurs here - and the temperature decreases with altitude.






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






15. A partially enclosed part of the ocean with rivers or streams flowing into it.






16. An international protocol designed to protect the ozone layer by phasing out the production of CFCs and other harmful chemicals.






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






18. Animals which eat grass and roots.






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






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






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






22. A layer of gasses surrounding the earth.






23. A forest near the equator with heavy rainfall and a great diversity of plant and animal life. Although a mere 2% of the earth is covered with these forests - they contain 50-80% of earth's land species.






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






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






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






27. Organisms which eat other organisms.






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






29. Consumers which eat decomposing organic material.






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






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






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






33. 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.






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






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






36. The process of a substance passing directly from the solid phase to the gaseous phase - and vice versa.






37. The loss of water vapor from leaves.






38. 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.






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






40. 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.






41. 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.






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






43. The crust and upper mantle of the earth.






44. Growing only one crop at a time.






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






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






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






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






49. 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.






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