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Test your basic knowledge |
PCAT Biology Ecology
Start Test
Study First
Subjects
:
pcat
,
biology
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. Used to include only the population and not their physical environment
Commensalism
Nitrogen cycle 1
Biotic Community
Tropical Rain Forest Plants
2. Freshwater Biomes vs. Saltwater 3: Freshwater biomes - except very large lakes - are affected by variations in _________. temperature of freshwater bodies varies considerably; they may freeze or dry up - and mud from their floors may be stirred up by
Competition Same Niche 3
Organism
Climate and weather
Nitrogen Cycle 2
3. Needs constant energy source and cycling of materials between the living system
Primary Consumers
Commensalism
Temperate Deciduous Forest Animals
Conditions for stability in an Ecosystem
4. Rhododendrons and pines are more suited for growth in acid oil
Competition Same Niche 3
Herbivores
Substratum-pH
Osmoregulation
5. Any group of similar organisms that are capable of reproducing
Species
Rootlike holdfasts
Physical Environment-Sunlight
Pyramid of Mass
6. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion
Hemeothermic (Warm Blooded)
Desert animals
Temperate Coniferous Plants
Community
7. Elemental nitrogen is chemically inert and cannot be used by most organisms. Lightning and nitrogen-fixing bacteria in the roots of legumes change the nitrogen into the usable - soluble nitrates
Nitrogen cycle 1
Grassland Animals
Herbivores
Biome
8. When one organism is benefited by the association and the other is not affected
Commensalism
Primary Consumers
Nitrogen
Dominant Species
9. Organisms that manufacture their own food
Nitrogen Cycle 3
Niche
Temperate Deciduous Forest Biome
Autotrophs
10. One species may be competitively superior to the other and drive the second to extinction
Competition Same Niche
Pelagic Zone
Hypotonic
Secondary Consumers
11. The chief disruptive force
Predator-Prey relationship
Carbon Cycle 2
Competition
Climate and weather
12. Composed of populations that are able to exist under the new conditions
Carbon Cycle 1
Successive Communities
Other Cycles
Predators
13. The vegetation that becomes dominant and stable after years of evolutiionary development
Ecosystem
Benthos
Biome
Coimax Vegetatioin
14. Integrated system of species that are dependent upon one another for survival
Tropical Rain Forest Animals
Community
Grassland Biome
Carbon Cycle 2
15. Deer - fox - woodchuck - and squirrel
Obligatory
Competition Same Niche 2
Communities
Temperate Deciduous Forest Animals
16. Regiong beneatht he photic zone that receives no light
Autotrophs
Aphotic Zone
Substratum-texture
Hydrosphere
17. The oceans
Aphotic Zone animals
Desert Biome
Heterotrophs
Hydrosphere
18. One species may be competitively superior in some regions - and the other may be superior in other regions under different environmental conditions. this would result in the elimination of one species in some places and the other in other places
Competition Same Niche 2
Parasitism
Producers
Nature of Biomes
19. Forest floors contain moss and lichens
Nitrogen cycle 1
Climax Community
Taiga Plants
Nitrogen Cycle 4
20. Vegetation has evolved adaptations for water conservation such as needle shaped leaves
Temperate Coniferous Plants
Food Pyramids
Competition Same Niche 2
Pyramid of Energy
21. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die
Nitrogen Cycle 3
Pyramid of Mass
Commensalism
Sere
22. Symbiotic relationship from which both organisms derive some benefit
Temperate Deciduous Forest Animals
Sere
Thundra Animals
Mutualims
23. Affect the type of vegetation that can be supported
Coimax Vegetatioin
Deep-sea Organisms
Substratum-Minerals
Carnivores
24. Nekton and benthos - scavengers - and predators (fiercely competitive)
Aphotic Zone animals
Population
Hydrosphere
Physical Environment-Sunlight
25. First to resettle a virgin area
Food Web
Lithosphere
Pioneer Organism
Saprophytes
26. Community in an ecological succession is identified by a dominant species
Sere
Abiotic (Physical) Environment
Pioneer Organism
Physical Environment-Temperature
27. Because organisms at the upper levels of the food chain derive their food energy from organisms at lower levels - and because energy is lost from one level to the next - each level can support a successively smaller biomass
Pyramid of Mass
Conditions for stability in an Ecosystem
Community
Poikilothermic (Cold Blooded)
28. Receive less than ten inches of rain each year; the rain is concentrated within a few heavy cloudbursts -ex: Sahara in Africa and Gobi in Asia
Heterotrophs
Nitrogen Cycle 2
Desert Biome
Ecological Succession
29. Characterized by low rainfall - although considerably more than the desert biomes receive -provide no shelter for herbivorous mammals from carnivorous predators -ex: East of the Rockies - steppes of the Ukraine - and the pampas of Argentina
Substratum-texture
Grassland Biome
Pelagic Zone
Second Law of Thermodynamics
30. Links between oceans and land
Marshes
Species
Photic zone
Obligatory
31. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes
Population
Physical Environment-Temperature
Coimax Vegetatioin
Hydrosphere
32. An essential component of amino acids and nucleic acids - which are the building blocks of all living things
Nitrogen
Ecosystem
Tropical Rain Forest Plants
Decomposer
33. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment
Tertiary Consumers
Climax Community
Dentrified
Symbionts
34. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition
Food Chain
Tertiary Consumers
Substratum (soil/rock)
Pyramid of Mass
35. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active
Biotic Environment
Poikilothermic (Cold Blooded)
Ecosystem
Nitrogen Cycle 5
36. Freshwater Biomes vs. Saltwater 1: Freshwater is _______________ which results in the passage of water into the cell. Freshwater organisms have homeostatic mechanisms to maintain water balance by the regular removal of the excess water. these include
Hypotonic
Aphotic Zone
Nitrogen Cycle 4
Thundra Animals
37. Rivers - lakes - ponds - and marshes
Ecology
Grassland Animals
Saprophytes
Freshwater Biomes
38. Receive less rainfall than the temperate forests - have long - cold winters - and are inhabited by single coniferous tree-the spruce -extreme northern parts of Canada and Russia
Taiga Biome
Tundra Plants
Photic zone
Sere
39. Include saprophytic organisms and organisms of decay
Decomposer
Competition Same Niche
Carbon Cycle 1
Climate and weather
40. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles
Photic Zone animals
Photic zone
Organism
Competition Same Niche 3
41. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids
Taiga Plants
Producers
Nitrogen Cycle 4
Symbionts
42. The nitrogen locked up in the wastes and dead tissues is released by the action of the bacteria of decay - which convert the proteins into ammonia
Temperate Deciduous Forest Plants
Nitrogen Cycle 4
Nature of Biomes
Taiga Biome
43. One or both organisms can't survive without the other
Pelagic Zone
Heterotrophs
Obligatory
Second Law of Thermodynamics
44. Two fates await the ammonia (NH3). some are nitrified or dentrified
Taiga Biome
Nitrogen Cycle 5
Marine Biomes
Desert Plants
45. Treeless - frozen plain found between the taiga lands and the northern ice sheets - very short summer and thus a very short growing season during which time the ground becomes wet and marshy
Primary Consumers
Pioneer Organism
Tundra Biome
Commensalism
46. Determined by the same decisive factors-temperatures and rainfall
Freshwater Biomes
Nature of Biomes
Desert Biome
Substratum-Humus
47. Only animal life and other heterotrophic life exists
Epiphytes
Aphotic Zone
Saprophytes
Other Cycles
48. More than 70% of earth -plants have little controlling influence in communities -most stable ecosystems; the conditions affecting temperature - amount of available oxygen and cabon dioxide - and amount of suspended or dissolve materials are very stab
Primary Consumers
Aquatic Biomes
Photic Zone animals
Carbon Cycle 1
49. The orderly process by which one biotic community replaces or succeeds another until a climax community is established
Ecological Succession
Taiga Plants
Competition
Nitrogen Cycle 2
50. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms
Material Cycles
Community
Saprophytes
Coimax Vegetatioin