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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. 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.






2. Animals which eat grass and roots.






3. Surface run-off caused by melted snow.






4. An act which set standards for the amount of pollution in water.






5. 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.






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






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






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






9. A group of similar organisms capable of interbreeding.






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






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






12. Consumers which eat only other animals.






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






14. An act which established and enforced acceptable levels of air pollution.






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






16. 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.






17. An act requiring federal agencies to detail the impact of proposed environmental policies.






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






19. 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






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






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






22. 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.






23. The loss of water vapor from leaves.






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






25. Evolution in one organism due to change in a related organism.






26. 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






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






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






29. 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.






30. 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.






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






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






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






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






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






36. Animals which eat leaves and shoots.






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






38. 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.






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






40. Consumers which eat decomposing organic material.






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






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






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






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






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






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






47. Species which react quickly to an environmental change and therefore can be used to diagnose a particular ecosystem.






48. 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.






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






50. A community of similar living organisms largely affected by the area's climate.







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