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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. Free-living organisms that feed on other living organisms
Ecosystem
Predators
Climate and weather
Parasitism
2. Frozen area with no vegetation and terrestrial animals -animals that do inhabit polar regions generally live near the polar oceans
Nitrogen Cycle 4
Rootlike holdfasts
Aquatic Biomes
Polar Region
3. 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
Littoral Zone
Tundra Biome
Carbon Cycle 3
Carnivores
4. Regiong beneatht he photic zone that receives no light
Aphotic Zone
Coimax Vegetatioin
Nitrogen Cycle 5
Symbionts
5. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion
Food Web
Hemeothermic (Warm Blooded)
Aquatic Biomes
Temperate Coniferous Forest Biome
6. 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
Biotic Community
Tertiary Consumers
Nitrogen Cycle 2
Second Law of Thermodynamics
7. 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
Substratum (soil/rock)
Other Cycles
Herbivores
Carbon Cycle 3
8. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat
Tundra Plants
Tropical Rain Forest Plants
Marine Biomes
Nitrogen cycle 1
9. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place
Temperate Deciduous Forest Animals
Nitrogen Cycle 3
Nitrogen
Photic Zone
10. Evolve toward a balance in which the predator is a regulatory influence on th prey but not a threat to its survival
Predator-Prey relationship
Community
Carnivores
Tertiary Consumers
11. First to resettle a virgin area
Pioneer Organism
Competition Same Niche
Taiga Biome
Nitrified
12. The ultimate source of energy for all organisms
Physical Environment-Sunlight
Littoral Zone Populations
Deep-sea Organisms
Thundra Animals
13. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins
Herbivores
Nitrogen Cycle 2
Tundra Plants
Environmental Factors
14. Two fates await the ammonia (NH3). some are nitrified or dentrified
Nitrogen Cycle 5
Nekton
Temperate Deciduous Forest Animals
Desert animals
15. Links between oceans and land
Climax Community
Freshwater Biomes
Marshes
Second Law of Thermodynamics
16. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down
Pyramid of Numbers
Symbionts
Taiga Animals
Communities
17. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria
Nitrogen
Predator-Prey relationship
Nitrified
Hypotonic
18. Deer - fox - woodchuck - and squirrel
Photic zone
Temperate Deciduous Forest Animals
Scavengers
Abiotic (Physical) Environment
19. 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
Nitrogen Cycle 4
Aphotic Zone
Symbionts
Species
20. One that exerts control over the other species that are present
Ecosystem
Taiga Biome
Competition Same Niche
Dominant Species
21. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes
Ecological Succession
Communities
Physical Environment-Temperature
Taiga Biome
22. Include saprophytic organisms and organisms of decay
Tundra Plants
Nature of Biomes
Decomposer
Photic Zone
23. Animals that feed on secondary consumer
Biome
Tropical Rain Forest Plants
Physical Environment-Temperature
Tertiary Consumers
24. Algae - crabs - crustacea - and many different species of fish
Population
Littoral Zone Populations
Marshes
Osmoregulation
25. Without a constant input of energy from the sun - an ecosystem would soon run down - as food is transferred from one level of the food chain to the next - a transfer of energy occurs
Biotic Community
Food Pyramids
Food Web
Climate and weather
26. Vegetation such as vines and eppiphytes
Ecosystem
Competition Same Niche 3
Food Web
Tropical Rain Forest Plants
27. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active
Symbionts
Substratum-texture
Poikilothermic (Cold Blooded)
Nitrified
28. 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
Marshes
Taiga Biome
Temperate Deciduous Forest Plants
Sere
29. Needs constant energy source and cycling of materials between the living system
Conditions for stability in an Ecosystem
Thundra Animals
Predator-Prey relationship
Substratum-Humus
30. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles
Organism
Carnivores
Substratum-Minerals
Benthos
31. Recycle water - oxygen - and phosphorus
Aphotic Zone
Photic Zone animals
Parasitism
Other Cycles
32. Encompasses all that is external to the organism and is necessary for its existence
Desert animals
Environment
Symbionts
Poikilothermic (Cold Blooded)
33. Determines the nature of plant and animal life in the soil
Climate and weather
Substratum (soil/rock)
Parasitism
Nature of Biomes
34. 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
Intertidal Zone
Nitrified
Abiotic (Physical) Environment
Competition Same Niche 2
35. 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
Grassland Biome
Biome
Community
Heterotrophs
36. Group of organisms of the same species living together in a given location
Carnivores
Commensalism
Deep-sea Organisms
Population
37. Animals eat plants and use the digested nutrients to form carbohydrates - fats - and proteins characteristic of the species. a part of these organic compounds is used as fuel in respiration in plants and animals
Coimax Vegetatioin
Carbon Cycle 2
Population
Substratum (soil/rock)
38. Freshwater Biomes vs. Saltwater 2: In rivers and streams - strong swift currents exist - and thus fish that have developed strong muscles and plants with _____________ have survived
Photic zone
Rootlike holdfasts
Competition
Freshwater Biomes
39. 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
Carbon Cycle 3
Nitrogen Cycle 2
Pyramid of Mass
Cohesive Force
40. Animals that consume green plants (herbivores)
Substratum-Minerals
Tundra Plants
Primary Consumers
Decomposer
41. Composed of populations that are able to exist under the new conditions
Substratum-texture
Successive Communities
Heterotrophs
Temperate Deciduous Forest Plants
42. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition
Communities
Food Chain
Pyramid of Mass
Producers
43. Affect the type of vegetation that can be supported
Carbon Cycle 2
Substratum-Minerals
Environmental Factors
Substratum (soil/rock)
44. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms
Biotic Environment
Tundra Biome
Symbionts
Competition Same Niche
45. 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
Commensalism
Pyramid of Energy
Saprophytes
Aphotic Zone
46. Food chain is not a simple linear chain but an intricate web
Nitrified
Biotic Community
Obligatory
Food Web
47. Adaptations for maintaining their internal osmolarity and conserving water
Poikilothermic (Cold Blooded)
Decomposer
Biome
Osmoregulation
48. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying
Pyramid of Numbers
Dentrified
Substratum-texture
Primary Consumers
49. Symbiotic relationship from which both organisms derive some benefit
Mutualims
Parasitism
Desert Plants
Second Law of Thermodynamics
50. Sunlit layer of the open sea extending to a depth of 250-600ft
Cohesive Force
Photic zone
Aphotic Zone
Marine Biomes