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 conversion of nitrates into nitrogen gas.






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






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






4. 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.






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






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






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






8. Precipitation which does not reach the soil but is instead collected by plants.






9. 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.






10. 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.






11. Growing only one crop at a time.






12. An influential book by Rachel Carson which helped begin the environmental movement.






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






14. An act which called for the careful examination of new chemicals to ensure they are safe for their intended uses.






15. The loss of water vapor from leaves.






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






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






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






19. A layer of gasses surrounding the earth.






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






21. Organisms which eat other organisms.






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






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






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






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






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






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






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






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






30. 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.






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






32. Animals which eat leaves and shoots.






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






34. Organisms which produce their own food.






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






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






37. The study of the interaction between organisms and their environment.






38. A variety of species living together.






39. 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.






40. 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.






41. Consumers which eat only other animals.






42. Organisms with a nucleus.






43. A greenhouse gas which also plays a key role in regulating ozone levels.






44. Modern man.






45. 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.






46. A transitional area between two different ecosystems.






47. Animals which eat grass and roots.






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






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






50. Consumers which eat both plants and animals.