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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. 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
Scavengers
Nitrogen Cycle 3
Competition Same Niche 3
Carbon Cycle 1
2. Rock and soil surface
Photic Zone animals
Lithosphere
Food Web
Osmoregulation
3. Animals that consume dead animals
Carbon Cycle 2
Scavengers
Obligatory
Organism
4. First to resettle a virgin area
Nitrogen Cycle 5
Biosphere
Substratum-pH
Pioneer Organism
5. When one organism is benefited by the association and the other is not affected
Commensalism
Biome
Substratum-texture
Ecosystem
6. 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
Temperate Coniferous Forest Biome
Second Law of Thermodynamics
Nitrified
Substratum-texture
7. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe
Omnivores
Obligatory
Secondary Consumers
Temperate Deciduous Forest Biome
8. Determined by the same decisive factors-temperatures and rainfall
Nature of Biomes
Conditions for stability in an Ecosystem
Cohesive Force
Grassland Animals
9. Food chain is not a simple linear chain but an intricate web
Food Chain
Food Web
Abiotic (Physical) Environment
Physical Environment- Water
10. An essential component of amino acids and nucleic acids - which are the building blocks of all living things
Nitrogen
Marshes
Nature of Biomes
Nitrogen Cycle 3
11. The vegetation that becomes dominant and stable after years of evolutiionary development
Coimax Vegetatioin
Desert Biome
Competition Same Niche 3
Aphotic Zone animals
12. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms
Ecology
Material Cycles
Temperate Coniferous Plants
Carbon Cycle 2
13. Encompasses all that is external to the organism and is necessary for its existence
Nitrogen Cycle 5
Desert Biome
Heterotrophs
Environment
14. Vegetation such as vines and eppiphytes
Marine Biomes
Aphotic Zone
Tropical Rain Forest Plants
Ecological Succession
15. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion
Hemeothermic (Warm Blooded)
Temperate Deciduous Forest Animals
Dominant Species
Benthos
16. Consists of populations of different plants and animal species interacting with each other in a given environment
Communities
Niche
Carbon Cycle 3
Substratum-Humus
17. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down
Pyramid of Mass
Temperate Deciduous Forest Plants
Pyramid of Numbers
Second Law of Thermodynamics
18. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition
Pelagic Zone
Taiga Biome
Food Chain
Competition
19. Community in an ecological succession is identified by a dominant species
Saprophytes
Producers
Sere
Physical Environment-Temperature
20. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active
Ecological Succession
Deep-sea Organisms
Hemeothermic (Warm Blooded)
Poikilothermic (Cold Blooded)
21. Animals that consume only plants or plant foods
Herbivores
Carbon Cycle 3
Coimax Vegetatioin
Organism
22. 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
Tundra Plants
Aquatic Biomes
Mutualims
Conditions for stability in an Ecosystem
23. Receive less rainfall than the temperate forests - have long - cold winters - and are inhabited by single coniferous tree-the spruce -extreme northern parts of Canada and Russia
Marshes
Biotic Environment
Littoral Zone
Taiga Biome
24. 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
Herbivores
Autotrophs
Obligatory
Intraspecific Interactions
25. 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
Intertidal Zone Population
Nitrogen cycle 1
Nitrogen Cycle 5
Hemeothermic (Warm Blooded)
26. Conserve water actively
Desert Plants
Tundra Biome
Substratum-texture
Nekton
27. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food
Intertidal Zone Population
Coimax Vegetatioin
Commensalism
Heterotrophs
28. 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
Pyramid of Mass
Carbon Cycle 1
Tundra Biome
Predators
29. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes
Tundra Biome
Physical Environment-Temperature
Tropical Rain Forest Plants
Pelagic Zone
30. Adaptations for maintaining their internal osmolarity and conserving water
Tropical Rain Forest Biome
Osmoregulation
Photic Zone
Nitrogen cycle 1
31. 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
Tundra Biome
Predators
Benthos
Intraspecific Interactions
32. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place
Photic Zone
Temperate Deciduous Forest Biome
Nature of Biomes
Communities
33. Includes the community and the environment and usually all five kingdoms
Ecosystem
Desert Biome
Pyramid of Energy
Marshes
34. Determines the nature of plant and animal life in the soil
Dentrified
Climax Community
Nature of Biomes
Substratum (soil/rock)
35. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles
Benthos
Aphotic Zone
Organism
Temperate Deciduous Forest Biome
36. 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
Aquatic Biomes
Epiphytes
Nitrified
Temperate Coniferous Forest Biome
37. Organisms that manufacture their own food
Nitrogen Cycle 5
Autotrophs
Pyramid of Mass
Mutualims
38. Distinct community in a geographic region
Second Law of Thermodynamics
Biome
Tropical Rain Forest Biome
Carbon Cycle 3
39. Lichens and moss
Freshwater Biomes
Tundra Plants
Carbon Cycle 3
Intraspecific Interactions
40. Animals eat plants and use the digested nutrients to form carbohydrates - fats - and proteins characteristic of the species. a part of these organic compounds is used as fuel in respiration in plants and animals
Temperate Coniferous Plants
Carbon Cycle 2
Nitrogen Cycle 4
Nitrogen Cycle 3
41. 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
Population
Tundra Plants
Carnivores
Aphotic Zone
42. 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
Nature of Biomes
Abiotic (Physical) Environment
Grassland Animals
43. 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
Biotic Community
Climate and weather
Photic Zone
Pyramid of Energy
44. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die
Second Law of Thermodynamics
Tertiary Consumers
Nitrogen Cycle 3
Intraspecific Interactions
45. One that exerts control over the other species that are present
Cohesive Force
Substratum-Minerals
Dominant Species
Aphotic Zone
46. The oceans
Hydrosphere
Photic zone
Saprophytes
Substratum-Humus
47. Include reproduction and protection from predators and destructive weather
Cohesive Force
Rootlike holdfasts
Conditions for stability in an Ecosystem
Temperate Coniferous Plants
48. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels
Successive Communities
Temperate Coniferous Forest Biome
Carnivores
Environmental Factors
49. When a parasite benefits at the expense of the host
Species
Parasitism
Climate and weather
Tropical Rain Forest Biome
50. Sunlit layer of the open sea extending to a depth of 250-600ft
Temperate Deciduous Forest Plants
Nitrogen Cycle 3
Parasitism
Photic zone