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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. Rivers - lakes - ponds - and marshes
Benthos
Substratum-pH
Freshwater Biomes
Commensalism
2. When a parasite benefits at the expense of the host
Second Law of Thermodynamics
Polar Region
Parasitism
Competition Same Niche 2
3. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor
Nitrogen
Epiphytes
Abiotic (Physical) Environment
Photic Zone animals
4. Animals that only eat other animals -possess pointed teeth and fang-like canine teeth for tearing flesh -have shorter digestive tracts because the easier digestibility of animal food
Biotic Environment
Carnivores
Omnivores
Ecosystem
5. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids
Competition Same Niche 2
Carbon Cycle 3
Ecosystem
Producers
6. Integrated system of species that are dependent upon one another for survival
Biosphere
Grassland Biome
Osmoregulation
Community
7. The major component of the internal environment of all living things
Physical Environment- Water
Mutualims
Food Chain
Nitrified
8. 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
Temperate Deciduous Forest Biome
Population
Tundra Biome
Ecological Succession
9. 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
Herbivores
Carbon Cycle 1
Dentrified
Nitrogen Cycle 4
10. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles
Organism
Competition Same Niche 3
Primary Consumers
Pioneer Organism
11. Include saprophytic organisms and organisms of decay
Aphotic Zone
Decomposer
Climax Community
Competition Same Niche
12. Determines water holding capacity
Littoral Zone
Community
Ecological Succession
Substratum-texture
13. Organisms that manufacture their own food
Successive Communities
Obligatory
Littoral Zone Populations
Autotrophs
14. Animals that consume primary consumers (carnivores)
Desert Biome
Secondary Consumers
Competition
Ecological Succession
15. Consists of populations of different plants and animal species interacting with each other in a given environment
Biosphere
Communities
Grassland Biome
Saprophytes
16. Region exposed to low tides that undergoes variations in temperature and periods of dryness
Biome
Grassland Biome
Intertidal Zone
Conditions for stability in an Ecosystem
17. 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 1
Littoral Zone
Desert Plants
Nature of Biomes
18. Active swimmers such as fish - sharks - or whales that feed on plankton and smaller fish
Competition Same Niche
Competition
Pyramid of Mass
Nekton
19. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying
Population
Dentrified
Climax Community
Grassland Biome
20. Regiong beneatht he photic zone that receives no light
Niche
Aphotic Zone
Omnivores
Climax Community
21. 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
Communities
Tropical Rain Forest Biome
Abiotic (Physical) Environment
22. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae
Lithosphere
Symbionts
Photic Zone animals
Pyramid of Energy
23. The orderly process by which one biotic community replaces or succeeds another until a climax community is established
Ecological Succession
Food Pyramids
Temperate Deciduous Forest Plants
Grassland Animals
24. Algae - crabs - crustacea - and many different species of fish
Littoral Zone Populations
Environment
Predators
Littoral Zone
25. Group of organisms of the same species living together in a given location
Desert Biome
Aphotic Zone
Population
Aquatic Biomes
26. First to resettle a virgin area
Other Cycles
Pioneer Organism
Aphotic Zone
Temperate Coniferous Forest Biome
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
Nitrogen cycle 1
Thundra Animals
Conditions for stability in an Ecosystem
28. Cold - dry - and inhabited by fir - pine - and spruce trees -much vegetation has evolved adaptations for water conservation such as needle-shaped leaves -Extreme Northern Part of the US and in Southern Canada
Obligatory
Temperate Coniferous Forest Biome
Ecological Succession
Intertidal Zone
29. Determine by the amount of decaying plant and animal life in the soil
Substratum-Humus
Carbon Cycle 2
Substratum-Minerals
Nitrified
30. Nekton and benthos - scavengers - and predators (fiercely competitive)
Symbionts
Temperate Deciduous Forest Biome
Aphotic Zone animals
Freshwater Biomes
31. Trees such as beech - maple - oaks - and willows shed their leaves during cold winters months
Freshwater Biomes
Grassland Biome
Temperate Deciduous Forest Plants
Obligatory
32. Adaptations for maintaining their internal osmolarity and conserving water
Marine Biomes
Osmoregulation
Physical Environment-Sunlight
Competition
33. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion
Marine Biomes
Species
Photic zone
Hemeothermic (Warm Blooded)
34. 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
Carbon Cycle 3
Carbon Cycle 2
Food Web
Tropical Rain Forest Plants
35. 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
Biome
Desert Plants
Aphotic Zone
36. 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
Pyramid of Mass
Aquatic Biomes
Predator-Prey relationship
Photic zone
37. Composed of populations that are able to exist under the new conditions
Biome
Poikilothermic (Cold Blooded)
Successive Communities
Competition Same Niche
38. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria
Biome
Pyramid of Mass
Omnivores
Nitrified
39. Include reproduction and protection from predators and destructive weather
Species
Cohesive Force
Biosphere
Competition Same Niche 3
40. Distinct community in a geographic region
Grassland Animals
Carbon Cycle 1
Desert Plants
Biome
41. 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
Commensalism
Successive Communities
Pyramid of Mass
42. Have adaptations enabling them to survive in very cod water - with high pressures - and in complete darkness
Symbionts
Temperate Coniferous Forest Biome
Substratum-Humus
Deep-sea Organisms
43. One species may be competitively superior to the other and drive the second to extinction
Competition Same Niche
Primary Consumers
Temperate Deciduous Forest Biome
Symbionts
44. Determined by the same decisive factors-temperatures and rainfall
Nature of Biomes
Autotrophs
Lithosphere
Marine Biomes
45. Food chain is not a simple linear chain but an intricate web
Photic Zone animals
Food Web
Climax Community
Organism
46. Crawling and sessile organsms
Scavengers
Aquatic Biomes
Benthos
Carbon Cycle 3
47. 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
Food Web
Omnivores
Climate and weather
Environmental Factors
48. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere
Environmental Factors
Biosphere
Temperate Coniferous Forest Biome
Nekton
49. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat
Marine Biomes
Other Cycles
Ecological Succession
Second Law of Thermodynamics
50. Needs constant energy source and cycling of materials between the living system
Desert Biome
Conditions for stability in an Ecosystem
Symbionts
Marine Biomes