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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. One or both organisms can't survive without the other
Obligatory
Scavengers
Substratum-pH
Tropical Rain Forest Plants
2. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place
Autotrophs
Species
Intraspecific Interactions
Photic Zone
3. Animals that consume primary consumers (carnivores)
Carbon Cycle 1
Osmoregulation
Pelagic Zone
Secondary Consumers
4. Region exposed to low tides that undergoes variations in temperature and periods of dryness
Carbon Cycle 2
Saprophytes
Intertidal Zone
Coimax Vegetatioin
5. Conserve water actively
Secondary Consumers
Carbon Cycle 1
Poikilothermic (Cold Blooded)
Desert Plants
6. 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
Primary Consumers
Climate and weather
Obligatory
Grassland Biome
7. Active swimmers such as fish - sharks - or whales that feed on plankton and smaller fish
Nekton
Physical Environment- Water
Substratum-pH
Tropical Rain Forest Plants
8. Animals that consume green plants (herbivores)
Food Chain
Competition Same Niche 2
Successive Communities
Primary Consumers
9. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion
Hemeothermic (Warm Blooded)
Nitrogen Cycle 2
Food Web
Substratum-texture
10. 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
Marine Biomes
Other Cycles
Pyramid of Energy
Predator-Prey relationship
11. 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
Sere
Nitrogen Cycle 3
Niche
Herbivores
12. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids
Producers
Lithosphere
Material Cycles
Temperate Deciduous Forest Animals
13. Algae - crabs - crustacea - and many different species of fish
Nekton
Carnivores
Littoral Zone Populations
Commensalism
14. Evolve toward a balance in which the predator is a regulatory influence on th prey but not a threat to its survival
Benthos
Environment
Predator-Prey relationship
Pyramid of Mass
15. Developed long legs and many are hoofed
Cohesive Force
Grassland Animals
Pioneer Organism
Parasitism
16. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor
Epiphytes
Mutualims
Substratum-pH
Substratum-Minerals
17. Determines water holding capacity
Thundra Animals
Decomposer
Rootlike holdfasts
Substratum-texture
18. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins
Communities
Nitrogen Cycle 2
Temperate Deciduous Forest Plants
Taiga Biome
19. Distinct community in a geographic region
Aquatic Biomes
Biome
Pioneer Organism
Niche
20. Rhododendrons and pines are more suited for growth in acid oil
Substratum-pH
Nitrogen Cycle 3
Photic zone
Intertidal Zone
21. One species may be competitively superior to the other and drive the second to extinction
Freshwater Biomes
Competition Same Niche
Organism
Physical Environment-Temperature
22. 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
Scavengers
Photic zone
Carnivores
Food Pyramids
23. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die
Grassland Animals
Nitrogen Cycle 3
Omnivores
Tertiary Consumers
24. Regiong beneatht he photic zone that receives no light
Primary Consumers
Aphotic Zone
Aphotic Zone animals
Photic Zone animals
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
Saprophytes
Community
Nitrogen cycle 1
Primary Consumers
26. Two fates await the ammonia (NH3). some are nitrified or dentrified
Successive Communities
Parasitism
Nitrogen Cycle 5
Nitrogen
27. 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
Carnivores
Competition Same Niche 3
Marshes
Carbon Cycle 3
28. Algae - sponges - clams - snails - sea urchins - starfish - and crabs
Photic Zone animals
Commensalism
Tropical Rain Forest Plants
Intertidal Zone Population
29. Integrated system of species that are dependent upon one another for survival
Hypotonic
Thundra Animals
Aquatic Biomes
Community
30. Determines the nature of plant and animal life in the soil
Desert animals
Food Pyramids
Substratum (soil/rock)
Hypotonic
31. Any group of similar organisms that are capable of reproducing
Species
Deep-sea Organisms
Nitrogen Cycle 3
Organism
32. 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
Intertidal Zone
Pyramid of Mass
Nitrogen Cycle 4
Obligatory
33. An essential component of amino acids and nucleic acids - which are the building blocks of all living things
Aphotic Zone animals
Nitrogen
Food Web
Dominant Species
34. Affect the type of vegetation that can be supported
Aquatic Biomes
Substratum-Minerals
Freshwater Biomes
Deep-sea Organisms
35. Encompasses all that is external to the organism and is necessary for its existence
Omnivores
Coimax Vegetatioin
Environment
Niche
36. 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
Substratum-pH
Substratum-texture
Tundra Biome
Biome
37. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels
Temperate Coniferous Plants
Environmental Factors
Desert animals
Food Pyramids
38. Only animal life and other heterotrophic life exists
Aphotic Zone
Nitrogen Cycle 5
Biosphere
Food Pyramids
39. One that exerts control over the other species that are present
Dominant Species
Grassland Animals
Tropical Rain Forest Animals
Climate and weather
40. 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
Carnivores
Carbon Cycle 1
Temperate Coniferous Forest Biome
Desert Plants
41. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds
Pyramid of Numbers
Taiga Animals
Organism
Nature of Biomes
42. Sunlit layer of the open sea extending to a depth of 250-600ft
Tropical Rain Forest Plants
Photic zone
Community
Dominant Species
43. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food
Heterotrophs
Aphotic Zone
Aquatic Biomes
Obligatory
44. Links between oceans and land
Desert animals
Tundra Plants
Marshes
Pioneer Organism
45. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active
Poikilothermic (Cold Blooded)
Marshes
Biome
Carnivores
46. 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
Successive Communities
Food Pyramids
Desert Biome
Nitrified
47. Vegetation has evolved adaptations for water conservation such as needle shaped leaves
Temperate Coniferous Plants
Substratum-pH
Biome
Heterotrophs
48. When one organism is benefited by the association and the other is not affected
Nitrogen cycle 1
Aphotic Zone
Obligatory
Commensalism
49. Region typical of the open seas and can be divided into photic and aphotic zones
Poikilothermic (Cold Blooded)
Pelagic Zone
Herbivores
Coimax Vegetatioin
50. Crawling and sessile organsms
Biotic Community
Pyramid of Numbers
Benthos
Hypotonic