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PCAT Biology Ecology
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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. Encompasses all that is external to the organism and is necessary for its existence
Environment
Conditions for stability in an Ecosystem
Biome
Nitrogen Cycle 3
2. Organisms that manufacture their own food
Autotrophs
Obligatory
Nature of Biomes
Substratum (soil/rock)
3. Symbiotic relationship from which both organisms derive some benefit
Pyramid of Numbers
Mutualims
Competition Same Niche 3
Aphotic Zone animals
4. 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
Coimax Vegetatioin
Epiphytes
Pyramid of Mass
Nature of Biomes
5. Developed long legs and many are hoofed
Climate and weather
Grassland Biome
Grassland Animals
Aquatic Biomes
6. Active swimmers such as fish - sharks - or whales that feed on plankton and smaller fish
Nekton
Tundra Plants
Omnivores
Niche
7. The ultimate source of energy for all organisms
Temperate Deciduous Forest Biome
Physical Environment-Sunlight
Taiga Plants
Biome
8. Used to include only the population and not their physical environment
Biotic Community
Intertidal Zone
Food Chain
Ecosystem
9. When one organism is benefited by the association and the other is not affected
Competition
Physical Environment-Temperature
Temperate Coniferous Plants
Commensalism
10. Algae - crabs - crustacea - and many different species of fish
Saprophytes
Deep-sea Organisms
Taiga Biome
Littoral Zone Populations
11. Region typical of the open seas and can be divided into photic and aphotic zones
Pelagic Zone
Carbon Cycle 1
Nitrogen Cycle 4
Nitrified
12. Nekton and benthos - scavengers - and predators (fiercely competitive)
Nitrogen
Aphotic Zone animals
Photic zone
Intertidal Zone Population
13. 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
Substratum-Minerals
Temperate Coniferous Forest Biome
Aphotic Zone animals
Nitrogen Cycle 4
14. Two fates await the ammonia (NH3). some are nitrified or dentrified
Intertidal Zone Population
Nitrogen Cycle 5
Substratum-pH
Ecosystem
15. One or both organisms can't survive without the other
Obligatory
Cohesive Force
Autotrophs
Littoral Zone Populations
16. Adaptations for maintaining their internal osmolarity and conserving water
Substratum-pH
Osmoregulation
Hemeothermic (Warm Blooded)
Hypotonic
17. Needs constant energy source and cycling of materials between the living system
Producers
Photic Zone animals
Desert animals
Conditions for stability in an Ecosystem
18. Includes climate - temperature - availability of light and water - and the local topology
Abiotic (Physical) Environment
Littoral Zone Populations
Scavengers
Tropical Rain Forest Plants
19. Animals that consume only plants or plant foods
Substratum (soil/rock)
Substratum-pH
Herbivores
Nitrogen Cycle 3
20. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants
Environment
Symbionts
Substratum-Minerals
Photic Zone animals
21. 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
Autotrophs
Competition Same Niche
Nature of Biomes
Desert Biome
22. Sunlit layer of the open sea extending to a depth of 250-600ft
Photic zone
Organism
Poikilothermic (Cold Blooded)
Omnivores
23. The chief disruptive force
Food Pyramids
Competition
Carbon Cycle 1
Conditions for stability in an Ecosystem
24. Defines the functional role of an organism in its ecosystem -described what the organism eats - where and how it obtains its food - what climatic factors it can tolerate and which are optimal - the nature of its parasites and predators - where and ho
Nitrogen Cycle 3
Biotic Environment
Niche
Pyramid of Numbers
25. Determines the nature of plant and animal life in the soil
Food Web
Second Law of Thermodynamics
Substratum (soil/rock)
Autotrophs
26. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food
Heterotrophs
Carbon Cycle 3
Tertiary Consumers
Second Law of Thermodynamics
27. 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
Climate and weather
Intertidal Zone Population
Nitrogen Cycle 4
Taiga Animals
28. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe
Marine Biomes
Commensalism
Temperate Deciduous Forest Biome
Tropical Rain Forest Plants
29. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels
Environmental Factors
Climate and weather
Competition Same Niche
Carbon Cycle 1
30. One species may be competitively superior to the other and drive the second to extinction
Nitrogen Cycle 5
Intertidal Zone Population
Climate and weather
Competition Same Niche
31. Animals that consume dead animals
Carbon Cycle 2
Cohesive Force
Nitrogen Cycle 2
Scavengers
32. Polar bears - musk oxen - and arctic hens
Nitrogen cycle 1
Thundra Animals
Symbionts
Grassland Animals
33. 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
Parasitism
Osmoregulation
Nitrogen cycle 1
Dentrified
34. Forest floors contain moss and lichens
Primary Consumers
Intraspecific Interactions
Epiphytes
Taiga Plants
35. Deer - fox - woodchuck - and squirrel
Producers
Commensalism
Temperate Deciduous Forest Animals
Species
36. Include reproduction and protection from predators and destructive weather
Nitrogen Cycle 4
Marine Biomes
Cohesive Force
Carnivores
37. The major component of the internal environment of all living things
Physical Environment- Water
Pioneer Organism
Thundra Animals
Coimax Vegetatioin
38. Algae - sponges - clams - snails - sea urchins - starfish - and crabs
Tropical Rain Forest Biome
Nitrogen Cycle 4
Osmoregulation
Intertidal Zone Population
39. The study of interactions between organisms and their environment
Nitrogen Cycle 2
Competition Same Niche
Ecology
Substratum (soil/rock)
40. Animals that consume green plants (herbivores)
Primary Consumers
Lithosphere
Species
Producers
41. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms
Benthos
Biome
Taiga Animals
Material Cycles
42. Evolve toward a balance in which the predator is a regulatory influence on th prey but not a threat to its survival
Epiphytes
Food Web
Community
Predator-Prey relationship
43. 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
Climate and weather
Second Law of Thermodynamics
Secondary Consumers
Cohesive Force
44. Composed of populations that are able to exist under the new conditions
Biome
Carbon Cycle 1
Successive Communities
Cohesive Force
45. One that exerts control over the other species that are present
Epiphytes
Dominant Species
Nitrogen Cycle 5
Tropical Rain Forest Animals
46. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria
Freshwater Biomes
Nitrified
Competition
Nitrogen Cycle 5
47. Region exposed to low tides that undergoes variations in temperature and periods of dryness
Taiga Plants
Lithosphere
Intertidal Zone
Secondary Consumers
48. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place
Niche
Photic Zone
Communities
Material Cycles
49. Region on the continental shelf that contains ocean area with depths up to 600 feet and extends several hundred miles from the shores
Temperate Coniferous Plants
Littoral Zone
Predator-Prey relationship
Population
50. 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
Food Web
Intertidal Zone
Taiga Plants
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