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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. 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
Aquatic Biomes
Nitrogen Cycle 3
Carnivores
Intertidal Zone
2. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures
Desert animals
Substratum-Humus
Marshes
Pyramid of Energy
3. When a parasite benefits at the expense of the host
Parasitism
Climate and weather
Environment
Nitrogen
4. Nekton and benthos - scavengers - and predators (fiercely competitive)
Aphotic Zone animals
Intraspecific Interactions
Pioneer Organism
Nekton
5. Two fates await the ammonia (NH3). some are nitrified or dentrified
Temperate Coniferous Plants
Climate and weather
Nitrogen Cycle 5
Dominant Species
6. 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
Community
Osmoregulation
Rootlike holdfasts
Biotic Environment
7. Includes the community and the environment and usually all five kingdoms
Freshwater Biomes
Competition Same Niche
Ecosystem
Carbon Cycle 1
8. An essential component of amino acids and nucleic acids - which are the building blocks of all living things
Aquatic Biomes
Aphotic Zone
Nitrogen
Taiga Biome
9. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor
Epiphytes
Nitrogen cycle 1
Ecosystem
Scavengers
10. 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
Nitrified
Material Cycles
Aphotic Zone
Nitrogen cycle 1
11. Gaseous CO2 enters the living world when plants use it to produce glucose via photosynthesis. The carbon atoms in CO2 are bonded to hydrogen and other carbon atoms. the plant uses the glucose to make starch - proteins - and fat
Scavengers
Carbon Cycle 1
Pyramid of Energy
Primary Consumers
12. 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
Biosphere
Competition Same Niche 3
Photic Zone
Tropical Rain Forest Biome
13. Region on the continental shelf that contains ocean area with depths up to 600 feet and extends several hundred miles from the shores
Littoral Zone
Omnivores
Carbon Cycle 1
Aphotic Zone
14. First to resettle a virgin area
Pyramid of Mass
Competition Same Niche 2
Pioneer Organism
Scavengers
15. Determine by the amount of decaying plant and animal life in the soil
Substratum-Humus
Nature of Biomes
Species
Food Web
16. 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
Tundra Plants
Taiga Biome
Substratum-Humus
Tropical Rain Forest Animals
17. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat
Nitrogen
Species
Nature of Biomes
Marine Biomes
18. 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
Thundra Animals
Commensalism
Decomposer
19. Adaptations for maintaining their internal osmolarity and conserving water
Physical Environment-Sunlight
Osmoregulation
Autotrophs
Competition Same Niche
20. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down
Carbon Cycle 2
Desert animals
Marshes
Pyramid of Numbers
21. The chief disruptive force
Pyramid of Mass
Competition
Biome
Mutualims
22. 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
Climate and weather
Pyramid of Numbers
Symbionts
Niche
23. 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
Community
Tropical Rain Forest Animals
Food Pyramids
Marine Biomes
24. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria
Thundra Animals
Primary Consumers
Nitrogen cycle 1
Nitrified
25. 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
Lithosphere
Desert Plants
Herbivores
26. Encompasses all that is external to the organism and is necessary for its existence
Nitrogen Cycle 2
Environment
Ecosystem
Abiotic (Physical) Environment
27. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins
Intertidal Zone Population
Dentrified
Nitrogen Cycle 2
Nitrogen Cycle 4
28. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae
Physical Environment-Sunlight
Photic Zone animals
Abiotic (Physical) Environment
Photic Zone
29. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition
Second Law of Thermodynamics
Tropical Rain Forest Biome
Polar Region
Food Chain
30. Algae - sponges - clams - snails - sea urchins - starfish - and crabs
Intertidal Zone Population
Intraspecific Interactions
Intertidal Zone
Aphotic Zone
31. Determined by the same decisive factors-temperatures and rainfall
Carbon Cycle 1
Nature of Biomes
Biotic Environment
Dominant Species
32. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds
Cohesive Force
Other Cycles
Littoral Zone
Taiga Animals
33. Include reproduction and protection from predators and destructive weather
Substratum-Humus
Cohesive Force
Population
Competition Same Niche
34. 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
Lithosphere
Grassland Biome
Nitrogen
Commensalism
35. Community in an ecological succession is identified by a dominant species
Substratum (soil/rock)
Sere
Intraspecific Interactions
Material Cycles
36. Composed of populations that are able to exist under the new conditions
Predators
Aphotic Zone
Nitrogen Cycle 5
Successive Communities
37. Organisms that manufacture their own food
Community
Ecology
Autotrophs
Tertiary Consumers
38. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants
Organism
Taiga Animals
Other Cycles
Symbionts
39. Needs constant energy source and cycling of materials between the living system
Desert animals
Temperate Coniferous Plants
Conditions for stability in an Ecosystem
Pioneer Organism
40. Symbiotic relationship from which both organisms derive some benefit
Saprophytes
Mutualims
Carbon Cycle 1
Taiga Biome
41. Polar bears - musk oxen - and arctic hens
Marshes
Saprophytes
Thundra Animals
Polar Region
42. Crawling and sessile organsms
Benthos
Second Law of Thermodynamics
Pyramid of Mass
Pyramid of Energy
43. Animals that consume primary consumers (carnivores)
Second Law of Thermodynamics
Hydrosphere
Secondary Consumers
Competition Same Niche
44. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels
Environmental Factors
Thundra Animals
Deep-sea Organisms
Taiga Plants
45. Consists of populations of different plants and animal species interacting with each other in a given environment
Predators
Temperate Deciduous Forest Plants
Ecosystem
Communities
46. The vegetation that becomes dominant and stable after years of evolutiionary development
Hydrosphere
Deep-sea Organisms
Coimax Vegetatioin
Environment
47. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe
Successive Communities
Pyramid of Numbers
Second Law of Thermodynamics
Temperate Deciduous Forest Biome
48. Group of organisms of the same species living together in a given location
Intertidal Zone Population
Population
Carbon Cycle 3
Nitrified
49. One species may be competitively superior to the other and drive the second to extinction
Competition Same Niche
Competition
Marshes
Physical Environment-Sunlight
50. 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
Freshwater Biomes
Competition
Coimax Vegetatioin