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






2. Growing only one crop at a time.






3. Organisms which thrive in low nutrient environments and usually have slow growth rates.






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






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






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






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






8. 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.






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






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






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






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






13. The rate at which producers create organic material.






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






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






16. The conversion of nitrates into nitrogen gas.






17. 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.






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






19. 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.






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






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






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






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






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






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






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






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






28. Single-celled organisms which lack a nucleus.






29. 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






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






31. The loss of water vapor from leaves.






32. The process by which pollutants are carried by flowing water - such as a river.






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






34. 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.






35. Organisms which eat other organisms.






36. 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.






37. All of the water found on earth.






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






39. Growing more than one crop at a time.






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






41. Animals which eat leaves and shoots.






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






43. Consumers which eat both plants and animals.






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






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






46. The middle atmospheric layer. Meteors burn up after entering this layer.






47. 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.






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






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






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