SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. Determined by the same decisive factors-temperatures and rainfall
Benthos
Rootlike holdfasts
Carnivores
Nature of Biomes
2. Rock and soil surface
Coimax Vegetatioin
Tropical Rain Forest Plants
Lithosphere
Biosphere
3. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place
Environment
Hypotonic
Environmental Factors
Photic Zone
4. Includes the community and the environment and usually all five kingdoms
Ecosystem
Temperate Deciduous Forest Biome
Tundra Biome
Tropical Rain Forest Animals
5. Sunlit layer of the open sea extending to a depth of 250-600ft
Photic zone
Community
Temperate Coniferous Plants
Desert animals
6. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins
Nitrogen Cycle 2
Physical Environment-Temperature
Photic Zone
Secondary Consumers
7. Forest floors contain moss and lichens
Taiga Plants
Biosphere
Nitrogen
Pioneer Organism
8. Encompasses all that is external to the organism and is necessary for its existence
Littoral Zone
Nitrogen Cycle 4
Environment
Population
9. Free-living organisms that feed on other living organisms
Temperate Coniferous Forest Biome
Other Cycles
Predators
Osmoregulation
10. 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
Mutualims
Grassland Biome
Nitrogen Cycle 3
Aphotic Zone animals
11. Animals that consume green plants (herbivores)
Saprophytes
Grassland Animals
Primary Consumers
Taiga Animals
12. The ultimate source of energy for all organisms
Coimax Vegetatioin
Aquatic Biomes
Physical Environment-Sunlight
Environmental Factors
13. Distinct community in a geographic region
Photic zone
Biome
Climax Community
Tundra Biome
14. 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
Niche
Communities
Physical Environment- Water
Biosphere
15. Polar bears - musk oxen - and arctic hens
Carbon Cycle 1
Community
Thundra Animals
Dominant Species
16. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures
Carbon Cycle 2
Nitrified
Symbionts
Desert animals
17. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat
Dominant Species
Marine Biomes
Aphotic Zone
Successive Communities
18. Determine by the amount of decaying plant and animal life in the soil
Other Cycles
Food Web
Substratum-Humus
Successive Communities
19. Links between oceans and land
Marshes
Dominant Species
Biotic Environment
Photic Zone animals
20. When a parasite benefits at the expense of the host
Parasitism
Littoral Zone Populations
Material Cycles
Competition Same Niche 2
21. Determines water holding capacity
Competition Same Niche 3
Substratum-texture
Substratum-Humus
Temperate Deciduous Forest Animals
22. An essential component of amino acids and nucleic acids - which are the building blocks of all living things
Symbionts
Physical Environment-Temperature
Parasitism
Nitrogen
23. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe
Carbon Cycle 3
Temperate Deciduous Forest Biome
Substratum-texture
Nitrogen Cycle 5
24. Animals that eat both plants and animals
Omnivores
Rootlike holdfasts
Parasitism
Grassland Biome
25. 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
Pyramid of Energy
Commensalism
Littoral Zone Populations
Carbon Cycle 2
26. 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
Pelagic Zone
Substratum-Minerals
Temperate Coniferous Plants
Saprophytes
27. Needs constant energy source and cycling of materials between the living system
Sere
Photic Zone
Osmoregulation
Conditions for stability in an Ecosystem
28. 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
Competition Same Niche 3
Environmental Factors
Parasitism
Climate and weather
29. One species may be competitively superior to the other and drive the second to extinction
Tropical Rain Forest Animals
Second Law of Thermodynamics
Competition Same Niche
Grassland Animals
30. The study of interactions between organisms and their environment
Osmoregulation
Ecology
Population
Omnivores
31. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria
Ecosystem
Substratum (soil/rock)
Nitrified
Decomposer
32. 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
Taiga Animals
Pyramid of Mass
Decomposer
Physical Environment-Sunlight
33. Trees such as beech - maple - oaks - and willows shed their leaves during cold winters months
Rootlike holdfasts
Tundra Plants
Second Law of Thermodynamics
Temperate Deciduous Forest Plants
34. Determines the nature of plant and animal life in the soil
Substratum (soil/rock)
Rootlike holdfasts
Obligatory
Nitrogen Cycle 4
35. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food
Material Cycles
Climax Community
Heterotrophs
Environment
36. 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
Sere
Nitrogen Cycle 3
Food Pyramids
Conditions for stability in an Ecosystem
37. Conserve water actively
Desert Plants
Temperate Deciduous Forest Biome
Second Law of Thermodynamics
Tropical Rain Forest Plants
38. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment
Conditions for stability in an Ecosystem
Food Pyramids
Osmoregulation
Climax Community
39. The oceans
Organism
Aphotic Zone animals
Hydrosphere
Cohesive Force
40. 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
Benthos
Nitrogen cycle 1
Competition
Commensalism
41. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor
Organism
Aphotic Zone
Epiphytes
Desert Plants
42. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die
Herbivores
Tundra Biome
Nitrogen Cycle 3
Biotic Environment
43. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants
Pyramid of Mass
Taiga Biome
Symbionts
Substratum (soil/rock)
44. Animals that consume primary consumers (carnivores)
Ecology
Secondary Consumers
Aphotic Zone
Physical Environment-Temperature
45. Animals that consume only plants or plant foods
Ecology
Herbivores
Producers
Epiphytes
46. Rivers - lakes - ponds - and marshes
Substratum-pH
Rootlike holdfasts
Sere
Freshwater Biomes
47. One that exerts control over the other species that are present
Marine Biomes
Dominant Species
Material Cycles
Nitrogen Cycle 5
48. Community in an ecological succession is identified by a dominant species
Commensalism
Sere
Polar Region
Photic Zone animals
49. Animals that feed on secondary consumer
Intertidal Zone Population
Deep-sea Organisms
Tertiary Consumers
Aphotic Zone
50. Any group of similar organisms that are capable of reproducing
Food Pyramids
Predators
Mutualims
Species