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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. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels
Environmental Factors
Temperate Deciduous Forest Plants
Coimax Vegetatioin
Polar Region
2. 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
Competition Same Niche
Carbon Cycle 2
Aquatic Biomes
Nekton
3. Distinct community in a geographic region
Carbon Cycle 2
Biome
Obligatory
Predator-Prey relationship
4. Symbiotic relationship from which both organisms derive some benefit
Material Cycles
Second Law of Thermodynamics
Mutualims
Symbionts
5. Consists of populations of different plants and animal species interacting with each other in a given environment
Decomposer
Nekton
Physical Environment-Temperature
Communities
6. 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
Saprophytes
Competition Same Niche 2
Littoral Zone Populations
Lithosphere
7. Animals that consume green plants (herbivores)
Primary Consumers
Material Cycles
Taiga Plants
Tropical Rain Forest Plants
8. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms
Substratum (soil/rock)
Cohesive Force
Biotic Environment
Predators
9. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria
Saprophytes
Cohesive Force
Nitrified
Temperate Deciduous Forest Animals
10. Polar bears - musk oxen - and arctic hens
Pioneer Organism
Dentrified
Thundra Animals
Temperate Deciduous Forest Animals
11. Community in an ecological succession is identified by a dominant species
Sere
Species
Desert Plants
Osmoregulation
12. First to resettle a virgin area
Temperate Coniferous Plants
Pioneer Organism
Ecosystem
Biotic Environment
13. Used to include only the population and not their physical environment
Biotic Community
Symbionts
Obligatory
Population
14. The orderly process by which one biotic community replaces or succeeds another until a climax community is established
Photic zone
Hydrosphere
Population
Ecological Succession
15. 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
Aphotic Zone animals
Decomposer
Temperate Deciduous Forest Plants
Food Pyramids
16. Evolve toward a balance in which the predator is a regulatory influence on th prey but not a threat to its survival
Heterotrophs
Predator-Prey relationship
Second Law of Thermodynamics
Ecosystem
17. One that exerts control over the other species that are present
Temperate Coniferous Plants
Communities
Desert Biome
Dominant Species
18. Vegetation such as vines and eppiphytes
Biome
Aphotic Zone
Primary Consumers
Tropical Rain Forest Plants
19. Trees such as beech - maple - oaks - and willows shed their leaves during cold winters months
Competition Same Niche 3
Intertidal Zone Population
Desert Plants
Temperate Deciduous Forest Plants
20. Rivers - lakes - ponds - and marshes
Substratum-Humus
Aphotic Zone animals
Thundra Animals
Freshwater Biomes
21. 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
Secondary Consumers
Pelagic Zone
Taiga Biome
Biome
22. The ultimate source of energy for all organisms
Tropical Rain Forest Biome
Food Chain
Physical Environment-Sunlight
Carnivores
23. Region exposed to low tides that undergoes variations in temperature and periods of dryness
Desert Plants
Saprophytes
Intraspecific Interactions
Intertidal Zone
24. Crawling and sessile organsms
Herbivores
Heterotrophs
Benthos
Marine Biomes
25. Links between oceans and land
Biotic Community
Marshes
Herbivores
Community
26. Rhododendrons and pines are more suited for growth in acid oil
Dominant Species
Herbivores
Competition Same Niche 3
Substratum-pH
27. Forest floors contain moss and lichens
Taiga Plants
Conditions for stability in an Ecosystem
Intertidal Zone Population
Autotrophs
28. Regiong beneatht he photic zone that receives no light
Successive Communities
Nitrogen cycle 1
Polar Region
Aphotic Zone
29. Vegetation has evolved adaptations for water conservation such as needle shaped leaves
Pyramid of Numbers
Second Law of Thermodynamics
Marshes
Temperate Coniferous Plants
30. 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
Taiga Plants
Scavengers
Substratum-Minerals
Aquatic Biomes
31. Organisms that manufacture their own food
Autotrophs
Heterotrophs
Nitrogen cycle 1
Polar Region
32. Determine by the amount of decaying plant and animal life in the soil
Substratum-Humus
Heterotrophs
Nitrogen
Rootlike holdfasts
33. Encompasses all that is external to the organism and is necessary for its existence
Aphotic Zone
Environment
Temperate Deciduous Forest Biome
Competition Same Niche
34. Food chain is not a simple linear chain but an intricate web
Dentrified
Physical Environment-Sunlight
Food Web
Nekton
35. The chief disruptive force
Substratum-Minerals
Competition
Scavengers
Environmental Factors
36. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down
Tropical Rain Forest Animals
Pyramid of Numbers
Climate and weather
Taiga Animals
37. Only animal life and other heterotrophic life exists
Tundra Plants
Aphotic Zone
Organism
Commensalism
38. Animals that eat both plants and animals
Omnivores
Predator-Prey relationship
Competition Same Niche 3
Poikilothermic (Cold Blooded)
39. Nekton and benthos - scavengers - and predators (fiercely competitive)
Nitrogen Cycle 4
Ecology
Climate and weather
Aphotic Zone animals
40. Developed long legs and many are hoofed
Omnivores
Grassland Animals
Niche
Nitrogen Cycle 3
41. 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
Osmoregulation
Carbon Cycle 3
Deep-sea Organisms
Temperate Deciduous Forest Biome
42. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food
Aphotic Zone animals
Biome
Heterotrophs
Taiga Plants
43. 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
Secondary Consumers
Temperate Coniferous Forest Biome
Primary Consumers
Aphotic Zone animals
44. Needs constant energy source and cycling of materials between the living system
Tropical Rain Forest Animals
Omnivores
Conditions for stability in an Ecosystem
Nitrogen Cycle 3
45. 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
Nitrogen Cycle 4
Aphotic Zone
Obligatory
46. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat
Marine Biomes
Taiga Plants
Nitrogen Cycle 4
Competition Same Niche 2
47. Sunlit layer of the open sea extending to a depth of 250-600ft
Population
Dominant Species
Photic zone
Conditions for stability in an Ecosystem
48. 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
Primary Consumers
Abiotic (Physical) Environment
Grassland Biome
Symbionts
49. The oceans
Biotic Community
Nitrogen Cycle 5
Photic Zone animals
Hydrosphere
50. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die
Material Cycles
Poikilothermic (Cold Blooded)
Nitrogen cycle 1
Nitrogen Cycle 3