SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. Vegetation has evolved adaptations for water conservation such as needle shaped leaves
Nitrogen cycle 1
Temperate Coniferous Plants
Photic Zone animals
Parasitism
2. Conserve water actively
Desert Plants
Competition Same Niche
Other Cycles
Successive Communities
3. The metabolically produced CO2 is released to the air. The rest of the orgnaic carbon remains locked whthin an organism until its death (except for wastes given off) - at which time decay processes by bacteria return the CO2 to the air
Heterotrophs
Nitrogen
Temperate Deciduous Forest Animals
Carbon Cycle 3
4. Recycle water - oxygen - and phosphorus
Photic zone
Other Cycles
Food Pyramids
Photic Zone
5. Nekton and benthos - scavengers - and predators (fiercely competitive)
Sere
Conditions for stability in an Ecosystem
Temperate Deciduous Forest Animals
Aphotic Zone animals
6. 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
Pyramid of Numbers
Thundra Animals
Temperate Deciduous Forest Plants
Nitrogen cycle 1
7. Used to include only the population and not their physical environment
Biotic Community
Aquatic Biomes
Abiotic (Physical) Environment
Nature of Biomes
8. Region on the continental shelf that contains ocean area with depths up to 600 feet and extends several hundred miles from the shores
Nitrogen Cycle 5
Littoral Zone
Environmental Factors
Niche
9. 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
Marshes
Dominant Species
Tundra Biome
10. When a parasite benefits at the expense of the host
Parasitism
Autotrophs
Obligatory
Rootlike holdfasts
11. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere
Physical Environment-Sunlight
Pyramid of Mass
Photic zone
Biosphere
12. Each member of a food chain uses some of the energy it obtains from its food for its own metabolism and loses some additional energy in the form of heat
Competition Same Niche
Pyramid of Mass
Pyramid of Energy
Aphotic Zone
13. 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
Second Law of Thermodynamics
Climate and weather
Substratum-pH
Benthos
14. Individuals belonging to the same species use the same resources and if a particular resource is limited - then these organisms must compete with one another
Physical Environment- Water
Competition
Intraspecific Interactions
Desert Plants
15. Frozen area with no vegetation and terrestrial animals -animals that do inhabit polar regions generally live near the polar oceans
Polar Region
Symbionts
Secondary Consumers
Taiga Biome
16. Needs constant energy source and cycling of materials between the living system
Conditions for stability in an Ecosystem
Saprophytes
Lithosphere
Pyramid of Mass
17. Two species may rapidly evolve in divergent directions under the strong selection pressure resulting from intense competition. thus - the two species would rapidly evolve greater differences in their niches
Pyramid of Energy
Nitrogen Cycle 2
Grassland Biome
Competition Same Niche 3
18. Animals that eat both plants and animals
Desert Biome
Tertiary Consumers
Aphotic Zone animals
Omnivores
19. Crawling and sessile organsms
Benthos
Physical Environment- Water
Successive Communities
Species
20. Includes climate - temperature - availability of light and water - and the local topology
Producers
Tertiary Consumers
Substratum-Minerals
Abiotic (Physical) Environment
21. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae
Benthos
Temperate Coniferous Forest Biome
Photic Zone animals
Intertidal Zone Population
22. Consists of populations of different plants and animal species interacting with each other in a given environment
Pyramid of Numbers
Communities
Niche
Photic Zone animals
23. Lichens and moss
Aphotic Zone
Hypotonic
Tundra Plants
Nitrogen Cycle 4
24. Every energy transfer involves a loss of energy and each level of the food chain uses some of the energy it obtains from the food for its own metabolism and loses some additional energy in the form of heat
Polar Region
Nitrogen cycle 1
Second Law of Thermodynamics
Nitrogen
25. Region exposed to low tides that undergoes variations in temperature and periods of dryness
Scavengers
Temperate Deciduous Forest Animals
Intertidal Zone
Polar Region
26. Adaptations for maintaining their internal osmolarity and conserving water
Intertidal Zone Population
Hypotonic
Osmoregulation
Cohesive Force
27. One that exerts control over the other species that are present
Intertidal Zone Population
Species
Biosphere
Dominant Species
28. Food chain is not a simple linear chain but an intricate web
Photic zone
Food Web
Littoral Zone Populations
Marshes
29. Forest floors contain moss and lichens
Ecology
Taiga Plants
Photic Zone animals
Niche
30. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down
Temperate Coniferous Plants
Organism
Commensalism
Pyramid of Numbers
31. The oceans
Hydrosphere
Community
Photic Zone animals
Substratum-Minerals
32. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active
Aphotic Zone animals
Temperate Deciduous Forest Biome
Nitrogen Cycle 3
Poikilothermic (Cold Blooded)
33. When one organism is benefited by the association and the other is not affected
Commensalism
Physical Environment- Water
Tropical Rain Forest Animals
Nature of Biomes
34. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die
Ecosystem
Taiga Biome
Biome
Nitrogen Cycle 3
35. Determines water holding capacity
Predators
Nitrogen cycle 1
Other Cycles
Substratum-texture
36. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food
Marine Biomes
Substratum-pH
Heterotrophs
Mutualims
37. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem
Saprophytes
Species
Photic Zone animals
Littoral Zone
38. Community in an ecological succession is identified by a dominant species
Pyramid of Numbers
Sere
Aphotic Zone
Physical Environment-Sunlight
39. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria
Pioneer Organism
Nitrified
Sere
Grassland Biome
40. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins
Environment
Second Law of Thermodynamics
Hemeothermic (Warm Blooded)
Nitrogen Cycle 2
41. Two fates await the ammonia (NH3). some are nitrified or dentrified
Substratum (soil/rock)
Nitrogen Cycle 5
Taiga Animals
Physical Environment- Water
42. Deer - fox - woodchuck - and squirrel
Temperate Deciduous Forest Animals
Pioneer Organism
Aquatic Biomes
Environmental Factors
43. Composed of populations that are able to exist under the new conditions
Organism
Cohesive Force
Successive Communities
Littoral Zone Populations
44. Links between oceans and land
Pioneer Organism
Marshes
Predators
Nature of Biomes
45. Polar bears - musk oxen - and arctic hens
Desert animals
Polar Region
Thundra Animals
Dentrified
46. Algae - sponges - clams - snails - sea urchins - starfish - and crabs
Intertidal Zone Population
Sere
Secondary Consumers
Desert Biome
47. The vegetation that becomes dominant and stable after years of evolutiionary development
Physical Environment-Sunlight
Littoral Zone
Coimax Vegetatioin
Littoral Zone Populations
48. The orderly process by which one biotic community replaces or succeeds another until a climax community is established
Ecological Succession
Biome
Taiga Plants
Intertidal Zone Population
49. Algae - crabs - crustacea - and many different species of fish
Intertidal Zone
Biotic Community
Littoral Zone Populations
Marine Biomes
50. Only animal life and other heterotrophic life exists
Freshwater Biomes
Aphotic Zone
Abiotic (Physical) Environment
Species