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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. Group of organisms of the same species living together in a given location
Population
Nitrogen Cycle 3
Pyramid of Mass
Conditions for stability in an Ecosystem
2. Adaptations for maintaining their internal osmolarity and conserving water
Pioneer Organism
Secondary Consumers
Tertiary Consumers
Osmoregulation
3. Needs constant energy source and cycling of materials between the living system
Conditions for stability in an Ecosystem
Pioneer Organism
Omnivores
Cohesive Force
4. 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
Grassland Animals
Aquatic Biomes
Freshwater Biomes
Coimax Vegetatioin
5. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants
Autotrophs
Predators
Littoral Zone Populations
Symbionts
6. Animals that feed on secondary consumer
Taiga Biome
Marine Biomes
Tertiary Consumers
Nitrogen cycle 1
7. Animals that consume primary consumers (carnivores)
Taiga Animals
Littoral Zone Populations
Secondary Consumers
Hydrosphere
8. Include saprophytic organisms and organisms of decay
Tropical Rain Forest Animals
Competition Same Niche 3
Decomposer
Marine Biomes
9. Includes climate - temperature - availability of light and water - and the local topology
Taiga Animals
Abiotic (Physical) Environment
Substratum-pH
Commensalism
10. Free-living organisms that feed on other living organisms
Predators
Food Web
Producers
Sere
11. Animals that consume green plants (herbivores)
Pyramid of Mass
Primary Consumers
Symbionts
Grassland Biome
12. One or both organisms can't survive without the other
Omnivores
Physical Environment-Temperature
Obligatory
Competition Same Niche 2
13. Polar bears - musk oxen - and arctic hens
Biome
Thundra Animals
Epiphytes
Photic Zone animals
14. 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
Abiotic (Physical) Environment
Competition
Pyramid of Mass
Deep-sea Organisms
15. Nekton and benthos - scavengers - and predators (fiercely competitive)
Nitrogen Cycle 4
Tundra Plants
Aphotic Zone animals
Nature of Biomes
16. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids
Producers
Climate and weather
Benthos
Nature of Biomes
17. Jungles characterized by high temperatures and torrential rains -found in Central Africa - Central America - the Amazon basic - and Southeast Asia
Substratum-Humus
Tropical Rain Forest Biome
Intraspecific Interactions
Sere
18. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat
Nitrogen
Marine Biomes
Coimax Vegetatioin
Other Cycles
19. 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
Symbionts
Parasitism
Substratum-pH
Carbon Cycle 3
20. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms
Secondary Consumers
Material Cycles
Herbivores
Nitrogen Cycle 5
21. Symbiotic relationship from which both organisms derive some benefit
Photic Zone
Species
Mutualims
Tropical Rain Forest Animals
22. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere
Desert Biome
Commensalism
Desert animals
Biosphere
23. Food chain is not a simple linear chain but an intricate web
Tundra Plants
Food Web
Autotrophs
Competition
24. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels
Biotic Community
Desert Plants
Hemeothermic (Warm Blooded)
Environmental Factors
25. Determines water holding capacity
Substratum-texture
Rootlike holdfasts
Osmoregulation
Environment
26. Have adaptations enabling them to survive in very cod water - with high pressures - and in complete darkness
Deep-sea Organisms
Second Law of Thermodynamics
Obligatory
Hypotonic
27. 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
Aphotic Zone
Competition Same Niche 2
Food Chain
Nekton
28. The orderly process by which one biotic community replaces or succeeds another until a climax community is established
Ecological Succession
Autotrophs
Grassland Biome
Photic zone
29. 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
Parasitism
Intraspecific Interactions
Predators
Taiga Plants
30. Algae - sponges - clams - snails - sea urchins - starfish - and crabs
Physical Environment-Sunlight
Intertidal Zone Population
Environment
Photic zone
31. 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
Secondary Consumers
Grassland Biome
Environmental Factors
Taiga Plants
32. Freshwater Biomes vs. Saltwater 1: Freshwater is _______________ which results in the passage of water into the cell. Freshwater organisms have homeostatic mechanisms to maintain water balance by the regular removal of the excess water. these include
Successive Communities
Littoral Zone
Hypotonic
Deep-sea Organisms
33. Community in an ecological succession is identified by a dominant species
Tropical Rain Forest Animals
Food Chain
Coimax Vegetatioin
Sere
34. Vegetation such as vines and eppiphytes
Intertidal Zone
Predator-Prey relationship
Tropical Rain Forest Plants
Pioneer Organism
35. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment
Hemeothermic (Warm Blooded)
Aphotic Zone
Aphotic Zone animals
Climax Community
36. Regiong beneatht he photic zone that receives no light
Aphotic Zone
Producers
Autotrophs
Climate and weather
37. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active
Poikilothermic (Cold Blooded)
Intertidal Zone
Herbivores
Community
38. Animals that eat both plants and animals
Omnivores
Nitrogen cycle 1
Marine Biomes
Second Law of Thermodynamics
39. When one organism is benefited by the association and the other is not affected
Commensalism
Cohesive Force
Other Cycles
Nitrified
40. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down
Food Web
Biosphere
Pyramid of Numbers
Desert Biome
41. The ultimate source of energy for all organisms
Pyramid of Mass
Deep-sea Organisms
Rootlike holdfasts
Physical Environment-Sunlight
42. Recycle water - oxygen - and phosphorus
Other Cycles
Substratum-Humus
Grassland Biome
Pioneer Organism
43. Algae - crabs - crustacea - and many different species of fish
Environment
Tropical Rain Forest Animals
Littoral Zone Populations
Herbivores
44. 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
Nekton
Food Chain
Tertiary Consumers
Rootlike holdfasts
45. Links between oceans and land
Decomposer
Intertidal Zone Population
Hypotonic
Marshes
46. 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
Osmoregulation
Material Cycles
Pioneer Organism
Nitrogen Cycle 4
47. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion
Temperate Deciduous Forest Animals
Hemeothermic (Warm Blooded)
Competition Same Niche
Hydrosphere
48. Animals that only eat other animals -possess pointed teeth and fang-like canine teeth for tearing flesh -have shorter digestive tracts because the easier digestibility of animal food
Carnivores
Photic Zone
Herbivores
Dominant Species
49. 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
Temperate Coniferous Forest Biome
Nekton
Autotrophs
Biosphere
50. Composed of populations that are able to exist under the new conditions
Substratum-pH
Tertiary Consumers
Successive Communities
Population