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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. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles
Herbivores
Photic zone
Grassland Animals
Organism
2. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids
Carbon Cycle 2
Producers
Carbon Cycle 1
Tertiary Consumers
3. Deer - fox - woodchuck - and squirrel
Secondary Consumers
Temperate Deciduous Forest Animals
Nature of Biomes
Niche
4. Determine by the amount of decaying plant and animal life in the soil
Freshwater Biomes
Osmoregulation
Communities
Substratum-Humus
5. 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
Cohesive Force
Pyramid of Energy
Other Cycles
Food Web
6. 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
Photic Zone animals
Niche
Ecology
7. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes
Physical Environment-Temperature
Tropical Rain Forest Plants
Material Cycles
Taiga Biome
8. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment
Temperate Deciduous Forest Animals
Ecological Succession
Climax Community
Decomposer
9. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins
Community
Organism
Nitrogen Cycle 2
Tundra Plants
10. Gaseous CO2 enters the living world when plants use it to produce glucose via photosynthesis. The carbon atoms in CO2 are bonded to hydrogen and other carbon atoms. the plant uses the glucose to make starch - proteins - and fat
Osmoregulation
Carbon Cycle 1
Biotic Environment
Climax Community
11. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae
Secondary Consumers
Photic Zone animals
Autotrophs
Pelagic Zone
12. Crawling and sessile organsms
Temperate Coniferous Forest Biome
Biosphere
Desert animals
Benthos
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
Tropical Rain Forest Animals
Cohesive Force
Climate and weather
Nekton
14. Vegetation such as vines and eppiphytes
Tropical Rain Forest Plants
Community
Ecology
Biome
15. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor
Species
Carbon Cycle 2
Epiphytes
Carnivores
16. When a parasite benefits at the expense of the host
Dominant Species
Tertiary Consumers
Parasitism
Physical Environment- Water
17. 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
Benthos
Material Cycles
Desert Biome
Deep-sea Organisms
18. Integrated system of species that are dependent upon one another for survival
Communities
Successive Communities
Ecology
Community
19. Free-living organisms that feed on other living organisms
Predators
Temperate Deciduous Forest Plants
Pyramid of Mass
Temperate Deciduous Forest Biome
20. Organisms that manufacture their own food
Autotrophs
Pyramid of Energy
Temperate Deciduous Forest Plants
Symbionts
21. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active
Ecosystem
Tertiary Consumers
Carbon Cycle 3
Poikilothermic (Cold Blooded)
22. The major component of the internal environment of all living things
Physical Environment- Water
Pelagic Zone
Hemeothermic (Warm Blooded)
Mutualims
23. One species may be competitively superior to the other and drive the second to extinction
Material Cycles
Competition Same Niche 2
Competition
Competition Same Niche
24. Region exposed to low tides that undergoes variations in temperature and periods of dryness
Secondary Consumers
Intertidal Zone
Community
Niche
25. Polar bears - musk oxen - and arctic hens
Secondary Consumers
Thundra Animals
Biosphere
Food Pyramids
26. Any group of similar organisms that are capable of reproducing
Nitrogen
Pyramid of Numbers
Material Cycles
Species
27. Group of organisms of the same species living together in a given location
Nitrogen Cycle 2
Communities
Taiga Plants
Population
28. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes
Tropical Rain Forest Animals
Secondary Consumers
Aphotic Zone animals
Intertidal Zone Population
29. 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
Herbivores
Osmoregulation
Temperate Coniferous Forest Biome
Biome
30. 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
Temperate Coniferous Forest Biome
Tundra Biome
Saprophytes
Temperate Deciduous Forest Plants
31. Trees such as beech - maple - oaks - and willows shed their leaves during cold winters months
Material Cycles
Temperate Deciduous Forest Plants
Heterotrophs
Aphotic Zone animals
32. 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
Tropical Rain Forest Animals
Hypotonic
Intraspecific Interactions
Desert animals
33. Includes the community and the environment and usually all five kingdoms
Saprophytes
Biome
Ecosystem
Carbon Cycle 2
34. Needs constant energy source and cycling of materials between the living system
Pelagic Zone
Conditions for stability in an Ecosystem
Taiga Biome
Tundra Plants
35. Algae - crabs - crustacea - and many different species of fish
Nitrogen Cycle 3
Carbon Cycle 1
Littoral Zone Populations
Biotic Environment
36. The orderly process by which one biotic community replaces or succeeds another until a climax community is established
Ecological Succession
Photic zone
Pyramid of Energy
Physical Environment-Temperature
37. The vegetation that becomes dominant and stable after years of evolutiionary development
Coimax Vegetatioin
Secondary Consumers
Food Chain
Temperate Deciduous Forest Plants
38. Sunlit layer of the open sea extending to a depth of 250-600ft
Physical Environment-Temperature
Pyramid of Numbers
Photic zone
Polar Region
39. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria
Symbionts
Intraspecific Interactions
Epiphytes
Nitrified
40. One that exerts control over the other species that are present
Parasitism
Benthos
Dominant Species
Nitrogen Cycle 2
41. Composed of populations that are able to exist under the new conditions
Aquatic Biomes
Successive Communities
Temperate Coniferous Forest Biome
Biosphere
42. Include reproduction and protection from predators and destructive weather
Temperate Deciduous Forest Biome
Littoral Zone Populations
Nitrogen Cycle 5
Cohesive Force
43. 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 Energy
Aquatic Biomes
Freshwater Biomes
Conditions for stability in an Ecosystem
44. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition
Nitrogen Cycle 3
Nitrogen Cycle 2
Freshwater Biomes
Food Chain
45. Forest floors contain moss and lichens
Taiga Plants
Autotrophs
Biome
Tundra Biome
46. Animals that consume only plants or plant foods
Littoral Zone
Material Cycles
Competition Same Niche 3
Herbivores
47. 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
Carbon Cycle 3
Temperate Deciduous Forest Biome
Second Law of Thermodynamics
Nitrogen Cycle 5
48. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food
Food Chain
Heterotrophs
Photic Zone animals
Species
49. 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
Littoral Zone Populations
Carbon Cycle 3
Omnivores
Taiga Biome
50. Active swimmers such as fish - sharks - or whales that feed on plankton and smaller fish
Nekton
Nitrogen Cycle 2
Freshwater Biomes
Niche