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






3. The loss of water vapor from leaves.






4. A group of similar organisms capable of interbreeding.






5. 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.






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






7. Plants taking in nitrates from the soil.






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






9. 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






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






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






12. 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.






13. All of the ecosystems on earth.






14. 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.






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






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






17. The conversion of nitrates into nitrogen gas.






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






19. 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.






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






21. 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.






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






23. Surface run-off caused by melted snow.






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






25. Growing more than one crop at a time.






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






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






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






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






30. The infiltration of harmful chemicals - particles - or biological matter into the atmosphere which endanger living organisms. Pollutants include sulfur and nitrogen oxides - ammonia - and chlorofluorocarbons. Although there are natural sources for th






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






32. Organisms which consume autotrophs for food.






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






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






35. 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.






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






37. A transitional area between two different ecosystems.






38. The flow of water in the water table.






39. 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.






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






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






42. Animals which eat leaves and shoots.






43. A law designed to locate toxic waste sites - gauge their pollution level - and ensure these sites are taken care of properly.






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






45. Consumers which eat only other animals.






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






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






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






49. An international protocol designed to stabilize global warming.






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