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. Growing only one crop at a time.






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






3. Organisms which eat other organisms.






4. Modern man.






5. Forests found in the northern regions of North America - Europe - and Asia characterized by freezing winters and warmer summers. These forests lie just below the tree line.






6. Animals which eat leaves and shoots.






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






8. A group of similar organisms capable of interbreeding.






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






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






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






12. The crust and upper mantle of the earth.






13. 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.






14. Any living thing on earth.






15. 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.






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






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






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






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






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






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






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






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






24. The conversion of nitrates into nitrogen gas.






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






26. A form of management which attempts to satisfy both the needs of humans and those of wildlife in the best way possible for both parties.






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






28. Growing more than one crop at a time.






29. 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.






30. An act which protects certain lands as national parks.






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






32. A transitional area between two different ecosystems.






33. An act which required the EPA to set standards for drinking water.






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






35. 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






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






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






38. Animals which eat grass and roots.






39. 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.






40. 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.






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






42. Consumers which eat decomposing organic material.






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






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






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






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






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






48. 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.






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






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