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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. Conserve water actively
Marshes
Successive Communities
Desert Plants
Predator-Prey relationship
2. Sunlit layer of the open sea extending to a depth of 250-600ft
Osmoregulation
Hydrosphere
Photic zone
Temperate Deciduous Forest Plants
3. 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
Ecosystem
Organism
Biotic Community
Rootlike holdfasts
4. The study of interactions between organisms and their environment
Nitrogen Cycle 2
Ecology
Decomposer
Competition Same Niche 3
5. Deer - fox - woodchuck - and squirrel
Heterotrophs
Community
Communities
Temperate Deciduous Forest Animals
6. The chief disruptive force
Tropical Rain Forest Animals
Desert Plants
Temperate Deciduous Forest Plants
Competition
7. 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
Temperate Deciduous Forest Plants
Environmental Factors
Tundra Biome
Community
8. 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
Communities
Aquatic Biomes
Taiga Plants
Tropical Rain Forest Plants
9. Determine by the amount of decaying plant and animal life in the soil
Taiga Plants
Marine Biomes
Substratum-Humus
Intertidal Zone
10. 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
Coimax Vegetatioin
Poikilothermic (Cold Blooded)
Second Law of Thermodynamics
Hypotonic
11. Region on the continental shelf that contains ocean area with depths up to 600 feet and extends several hundred miles from the shores
Photic zone
Food Web
Littoral Zone
Carbon Cycle 1
12. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes
Polar Region
Physical Environment-Temperature
Aphotic Zone animals
Competition
13. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment
Substratum-Humus
Nitrified
Polar Region
Climax Community
14. Determines the nature of plant and animal life in the soil
Nekton
Niche
Substratum (soil/rock)
Substratum-pH
15. Rock and soil surface
Carbon Cycle 2
Grassland Biome
Littoral Zone Populations
Lithosphere
16. 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
Carbon Cycle 3
Substratum-Humus
Autotrophs
Pyramid of Numbers
17. Developed long legs and many are hoofed
Substratum-texture
Cohesive Force
Grassland Animals
Pyramid of Numbers
18. Algae - sponges - clams - snails - sea urchins - starfish - and crabs
Intertidal Zone Population
Desert Plants
Dominant Species
Carbon Cycle 1
19. Encompasses all that is external to the organism and is necessary for its existence
Environment
Biome
Aphotic Zone
Grassland Biome
20. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying
Nitrogen Cycle 5
Dentrified
Desert Biome
Nekton
21. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds
Nitrogen
Ecology
Taiga Animals
Community
22. When one organism is benefited by the association and the other is not affected
Commensalism
Parasitism
Aphotic Zone
Heterotrophs
23. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food
Desert animals
Competition Same Niche 3
Pyramid of Mass
Heterotrophs
24. An essential component of amino acids and nucleic acids - which are the building blocks of all living things
Desert Biome
Pelagic Zone
Nitrogen
Benthos
25. Symbiotic relationship from which both organisms derive some benefit
Nitrogen Cycle 3
Nitrogen
Mutualims
Parasitism
26. The orderly process by which one biotic community replaces or succeeds another until a climax community is established
Freshwater Biomes
Ecological Succession
Thundra Animals
Hydrosphere
27. 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
Abiotic (Physical) Environment
Aquatic Biomes
Grassland Biome
Producers
28. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants
Symbionts
Temperate Deciduous Forest Plants
Autotrophs
Desert animals
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
Intertidal Zone
Parasitism
Poikilothermic (Cold Blooded)
Intraspecific Interactions
30. 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
Biotic Environment
Nitrogen cycle 1
Community
Environmental Factors
31. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria
Second Law of Thermodynamics
Nitrified
Competition
Tropical Rain Forest Animals
32. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes
Tropical Rain Forest Animals
Environment
Desert Biome
Successive Communities
33. Distinct community in a geographic region
Littoral Zone
Conditions for stability in an Ecosystem
Biome
Ecology
34. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels
Environmental Factors
Coimax Vegetatioin
Littoral Zone Populations
Hydrosphere
35. Two species may rapidly evolve in divergent directions under the strong selection pressure resulting from intense competition. thus - the two species would rapidly evolve greater differences in their niches
Grassland Animals
Temperate Coniferous Plants
Competition Same Niche 3
Biome
36. Trees such as beech - maple - oaks - and willows shed their leaves during cold winters months
Temperate Deciduous Forest Plants
Ecosystem
Climax Community
Saprophytes
37. The major component of the internal environment of all living things
Nitrogen cycle 1
Aphotic Zone
Temperate Deciduous Forest Animals
Physical Environment- Water
38. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die
Nitrogen Cycle 3
Aquatic Biomes
Aphotic Zone
Nitrogen
39. Recycle water - oxygen - and phosphorus
Substratum-texture
Substratum-pH
Other Cycles
Littoral Zone
40. 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
Taiga Plants
Carnivores
Nitrogen Cycle 5
Nitrogen Cycle 3
41. 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
Competition Same Niche 2
Littoral Zone Populations
Substratum-Humus
Tropical Rain Forest Plants
42. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active
Photic Zone animals
Poikilothermic (Cold Blooded)
Tropical Rain Forest Animals
Hypotonic
43. Have adaptations enabling them to survive in very cod water - with high pressures - and in complete darkness
Second Law of Thermodynamics
Biotic Community
Deep-sea Organisms
Dentrified
44. Adaptations for maintaining their internal osmolarity and conserving water
Osmoregulation
Hemeothermic (Warm Blooded)
Benthos
Nitrogen Cycle 3
45. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae
Photic Zone animals
Community
Photic zone
Tertiary Consumers
46. Two fates await the ammonia (NH3). some are nitrified or dentrified
Producers
Mutualims
Cohesive Force
Nitrogen Cycle 5
47. Animals that eat both plants and animals
Tundra Biome
Aphotic Zone animals
Omnivores
Material Cycles
48. Animals that consume dead animals
Marine Biomes
Scavengers
Saprophytes
Environment
49. Animals that feed on secondary consumer
Tertiary Consumers
Nitrogen cycle 1
Substratum-Minerals
Lithosphere
50. Food chain is not a simple linear chain but an intricate web
Species
Sere
Food Web
Ecological Succession