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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. Determines water holding capacity
Substratum-texture
Competition
Environment
Physical Environment- Water
2. Evolve toward a balance in which the predator is a regulatory influence on th prey but not a threat to its survival
Predator-Prey relationship
Cohesive Force
Scavengers
Material Cycles
3. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere
Food Web
Biosphere
Temperate Deciduous Forest Animals
Decomposer
4. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants
Symbionts
Competition
Nitrogen
Biome
5. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes
Photic zone
Tundra Plants
Taiga Plants
Physical Environment-Temperature
6. Nekton and benthos - scavengers - and predators (fiercely competitive)
Thundra Animals
Secondary Consumers
Aphotic Zone animals
Ecology
7. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active
Osmoregulation
Temperate Deciduous Forest Animals
Competition Same Niche 3
Poikilothermic (Cold Blooded)
8. Symbiotic relationship from which both organisms derive some benefit
Mutualims
Marshes
Nitrogen Cycle 2
Food Web
9. Rivers - lakes - ponds - and marshes
Freshwater Biomes
Desert Plants
Tropical Rain Forest Animals
Physical Environment- Water
10. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying
Substratum-Minerals
Heterotrophs
Dentrified
Nitrogen
11. Links between oceans and land
Marshes
Substratum-Humus
Taiga Biome
Conditions for stability in an Ecosystem
12. The major component of the internal environment of all living things
Commensalism
Physical Environment- Water
Thundra Animals
Herbivores
13. Animals that feed on secondary consumer
Tertiary Consumers
Nitrogen Cycle 2
Dominant Species
Competition
14. Animals that consume primary consumers (carnivores)
Grassland Animals
Other Cycles
Secondary Consumers
Physical Environment-Sunlight
15. The study of interactions between organisms and their environment
Ecology
Temperate Deciduous Forest Animals
Temperate Coniferous Forest Biome
Tundra Plants
16. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels
Autotrophs
Food Chain
Environmental Factors
Population
17. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes
Tropical Rain Forest Animals
Communities
Substratum-Minerals
Tropical Rain Forest Plants
18. 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
Nitrogen Cycle 4
Epiphytes
19. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die
Temperate Deciduous Forest Biome
Nitrogen Cycle 3
Food Web
Saprophytes
20. When one organism is benefited by the association and the other is not affected
Producers
Food Chain
Commensalism
Communities
21. The oceans
Nitrogen cycle 1
Hydrosphere
Aphotic Zone
Taiga Plants
22. 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
Physical Environment-Temperature
Decomposer
Substratum-pH
23. Developed long legs and many are hoofed
Omnivores
Benthos
Grassland Animals
Nitrogen Cycle 3
24. One that exerts control over the other species that are present
Decomposer
Dominant Species
Biotic Community
Abiotic (Physical) Environment
25. The orderly process by which one biotic community replaces or succeeds another until a climax community is established
Dominant Species
Decomposer
Coimax Vegetatioin
Ecological Succession
26. Determined by the same decisive factors-temperatures and rainfall
Biosphere
Nature of Biomes
Decomposer
Producers
27. Include saprophytic organisms and organisms of decay
Poikilothermic (Cold Blooded)
Freshwater Biomes
Decomposer
Commensalism
28. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion
Epiphytes
Desert Plants
Tropical Rain Forest Biome
Hemeothermic (Warm Blooded)
29. One species may be competitively superior to the other and drive the second to extinction
Competition Same Niche
Nitrogen Cycle 2
Substratum-Minerals
Biome
30. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles
Polar Region
Physical Environment- Water
Organism
Grassland Biome
31. 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
Tundra Plants
Nitrogen Cycle 4
Osmoregulation
Substratum (soil/rock)
32. 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
Nitrogen Cycle 2
Species
Desert animals
Aquatic Biomes
33. 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
Temperate Deciduous Forest Plants
Hemeothermic (Warm Blooded)
Commensalism
Hypotonic
34. Vegetation such as vines and eppiphytes
Tropical Rain Forest Plants
Thundra Animals
Littoral Zone Populations
Desert Plants
35. Rock and soil surface
Successive Communities
Substratum-Humus
Lithosphere
Tundra Biome
36. One or both organisms can't survive without the other
Communities
Obligatory
Sere
Intertidal Zone
37. Consists of populations of different plants and animal species interacting with each other in a given environment
Nitrogen Cycle 4
Food Chain
Carbon Cycle 3
Communities
38. Sunlit layer of the open sea extending to a depth of 250-600ft
Photic zone
Temperate Coniferous Plants
Nitrified
Hemeothermic (Warm Blooded)
39. Group of organisms of the same species living together in a given location
Environmental Factors
Population
Poikilothermic (Cold Blooded)
Tundra Biome
40. 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
Photic Zone animals
Tundra Biome
Competition
Temperate Coniferous Forest Biome
41. Active swimmers such as fish - sharks - or whales that feed on plankton and smaller fish
Herbivores
Sere
Aphotic Zone animals
Nekton
42. 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
Temperate Coniferous Forest Biome
Grassland Biome
Hydrosphere
Biome
43. 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
Desert Biome
Intertidal Zone Population
Nitrogen
Secondary Consumers
44. 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
Substratum-pH
Osmoregulation
Ecology
45. Only animal life and other heterotrophic life exists
Aphotic Zone
Lithosphere
Tropical Rain Forest Biome
Heterotrophs
46. Community in an ecological succession is identified by a dominant species
Sere
Population
Decomposer
Rootlike holdfasts
47. Recycle water - oxygen - and phosphorus
Grassland Biome
Other Cycles
Rootlike holdfasts
Marine Biomes
48. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor
Hemeothermic (Warm Blooded)
Marshes
Epiphytes
Species
49. Needs constant energy source and cycling of materials between the living system
Competition
Rootlike holdfasts
Tropical Rain Forest Biome
Conditions for stability in an Ecosystem
50. 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
Second Law of Thermodynamics
Carbon Cycle 3
Commensalism
Nitrogen Cycle 5