SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
Test your basic knowledge |
DSST Environment And Humanity
Start Test
Study First
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. 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.
Tundra
Carnivores
Coevolution
Eutrophication
2. Animals which eat grass and roots.
Grazers
Air Pollution
Advection
Taiga
3. Species which serve key roles in an ecosystem. The absence of these important organisms is detrimental to the surrounding area.
Acid Rain
Keystone Species
Earth Summit
Grazers
4. The cycling and reusing of elements and molecules (such as water - nitrogen - and phosphorus) that are essential to life.
Temperate Rain Forest
Coevolution
Trophic Level
Biogeochemical Cycle
5. 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
Antarctica
Ecotone
Montreal Protocol
Nitrification
6. The amount of pests needed before spraying pesticides is economical.
Population
Antarctica
Ecosystem
Economic Threshold
7. All members of a species which live in the same area.
Neanderthals
Population
Troposphere
Grasslands
8. An act which called for the careful examination of new chemicals to ensure they are safe for their intended uses.
Nitrification
Organism
Toxic Substances Control Act
Ecological Niche
9. Species which react quickly to an environmental change and therefore can be used to diagnose a particular ecosystem.
Speciation
Competitive Exclusion
Indicator Species
Hetrotrophs
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.
Superfund Law
Montreal Protocol
Homo Habilis
Polyculture
11. 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.
Deciduous Forest
Producers
Intensive Subsistence Farming
Gross Primary Product
12. 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.
Evaporation
Polyculture
Superfund Law
Taiga
13. Average expected birth rate for 1 -000 women.
Tropopause
Trophic Level
Total Fertility Rate
Temperature Inversion
14. 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.
Speciation
Transpiration
Biodiversity
Chaparral
15. An act which established and enforced acceptable levels of air pollution.
Sahelanthropus Tchadensis
Condensation
Clean Air Act
Temperate Rain Forest
16. Populations characterized by large size - long lifespan - and few offspring.
K-Selected Populations
Detrivores
Coevolution
Autotrophs
17. The rate at which producers create organic material.
UN Conference on Population and Development
Insurance Spraying
Intensive Subsistence Farming
Gross Primary Product
18. A type of symbiosis where one species benefit at the expense of the other.
Estuary
Environmental Ethics
Toxic Substances Control Act
Parasitism
19. The area between the troposphere and the stratosphere. Here the temperature reverses from decreasing to increasing with altitude.
Estuary
Clean Air Act
Stockholm Conference
Tropopause
20. A transitional area between two different ecosystems.
Ammonification
Ecotone
Tropopause
Biomes
21. 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.
Evapotranspiration
Deciduous Forest
Aldo Leopold
Acid Rain
22. The middle atmospheric layer. Meteors burn up after entering this layer.
Keystone Species
Mesosphere
Agroforestry
R-Selected Populations
23. An act which required the EPA to set standards for drinking water.
Safe Drinking Water Act
Troposphere
Polyculture
Brackish Water
24. Grasslands with short - widely spaced trees and no canopy - allowing for an unbroken layer of grasses beneath.
Tropical Rain Forest
Hydrologic Cycle
Savannah
Autotrophs
25. A group of similar organisms capable of interbreeding.
Ozone
UN Conference on Population and Development
Ecosystem
Species
26. Organisms which thrive in high nutrient environments - especially those with plenty of carbon.
Copiotrophs
Ammonification
Sublimation
Sahelanthropus Tchadensis
27. The cloudiness of a liquid due to small suspended particles.
Snowmelt
Turbidity
Nitrous Oxide
World Trade Organization
28. Different species living in close contact with each other.
Monoculture
Stratosphere
Symbiosis
Grasslands
29. A greenhouse gas which also plays a key role in regulating ozone levels.
Nitrous Oxide
Ammonification
Wilderness Act
Carbon Dioxide
30. Biomes with less than 10 inches of rain a year. Foliage is scarce in these areas - and remaining plants and animals work hard to conserve the little water they receive.
Autotrophs
Deserts
Air Pollution
Australopithecus Afarensis
31. An agency created to establish regulations concerning pollutants to protect humans and the environment.
Temperature Inversion
Environmental Protection Agency
Carbon Dioxide
Advection
32. A type of symbiosis where each species will benefit from interacting with the other.
Infiltration
Superfund Law
Harmful Algal Bloom
Mutualism
33. A type of farming where the farmer will grow just enough crops to satisfy his family's needs for the next year.
Autotrophs
Carnivores
Subsistence Farming
Carbon Dioxide
34. The UN's first major conference on environmental issues.
Endangered Species Act
Ammonification
Stockholm Conference
Toxic Substances Control Act
35. Water found in estuaries. This water is a mixture of saltine ocean water and fresh water - usually from a river or stream.
Ecosystem
Savannah
Brackish Water
Lithosphere
36. An American environmentalist who is famous for promoting the ideas of environmental ethics and wildlife management.
Aldo Leopold
Commensalism
Economic Threshold
Homo Erectus
37. The spraying of pesticides to prevent a pest problem before it happens.
Air Pollution
Homo Sapiens
Endangered Species Act
Insurance Spraying
38. A UN conference held in Rio de Janeiro. The conference decided to protect biodiversity - reduce pollution emissions and greenhouse gasses - and promote sustainable development.
Subsistence Farming
Acid Rain
Precipitation
Earth Summit
39. An act created to protect endangered and threatened species.
Cosmetic Spraying
UN Conference on Population and Development
Harmful Algal Bloom
Endangered Species Act
40. Surface run-off caused by melted snow.
Competitive Exclusion
Snowmelt
Methane
Exosphere
41. The process of a gas transforming into a liquid.
Ecology
Deciduous Forest
Condensation
Interplanting
42. A partially enclosed part of the ocean with rivers or streams flowing into it.
Vienna Convention for the Protection of the Ozone Layer
Estuary
Social Ecology
Thermosphere
43. Integrating rows of trees alongside crops to provide mulch and shade - retain water in the soil - and promote sustainable land use.
Evaporation
Autotrophs
Oligotrophs
Agroforestry
44. The flow of water in the water table.
Wilderness Act
Coniferous Forest
Atmosphere
Subsurface flow
45. All of the ecosystems on earth.
Tundra
Biosphere
Economic Threshold
Gross Primary Product
46. Plants taking in nitrates from the soil.
Harmful Algal Bloom
Trophic Level
Interception
Assimilation
47. The crust and upper mantle of the earth.
Lithosphere
Coevolution
Wilderness Act
Hydrosphere
48. A theory that our current ecological problems are a product of deeper social problems.
Social Ecology
Organism
Mutualism
Aldo Leopold
49. The oxification of ammonia by certain bacterium into nitrite and later into nitrates - which can then be used by plants.
Nitrification
Detrivores
Assimilation
Non-government Organizations
50. The process of a substance passing directly from the solid phase to the gaseous phase - and vice versa.
Mutualism
Sublimation
Montreal Protocol
Temperature Inversion