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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. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids
Producers
Biosphere
Taiga Plants
Food Web
2. The orderly process by which one biotic community replaces or succeeds another until a climax community is established
Intertidal Zone
Ecological Succession
Competition Same Niche
Thundra Animals
3. Active swimmers such as fish - sharks - or whales that feed on plankton and smaller fish
Carbon Cycle 2
Nekton
Nitrogen Cycle 3
Marshes
4. 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
Competition Same Niche
Substratum (soil/rock)
Cohesive Force
Taiga Biome
5. 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
Omnivores
Conditions for stability in an Ecosystem
Tundra Biome
Thundra Animals
6. The chief disruptive force
Marine Biomes
Nekton
Competition
Thundra Animals
7. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants
Ecosystem
Biome
Poikilothermic (Cold Blooded)
Symbionts
8. 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
Photic Zone animals
Littoral Zone Populations
Food Pyramids
Competition
9. The vegetation that becomes dominant and stable after years of evolutiionary development
Marine Biomes
Primary Consumers
Coimax Vegetatioin
Tertiary Consumers
10. Animals that eat both plants and animals
Second Law of Thermodynamics
Sere
Climax Community
Omnivores
11. Affect the type of vegetation that can be supported
Desert Plants
Substratum-Minerals
Saprophytes
Carbon Cycle 3
12. Region exposed to low tides that undergoes variations in temperature and periods of dryness
Pyramid of Numbers
Intertidal Zone
Food Chain
Carnivores
13. Sunlit layer of the open sea extending to a depth of 250-600ft
Dentrified
Substratum-Minerals
Benthos
Photic zone
14. Forest floors contain moss and lichens
Substratum-Minerals
Ecology
Taiga Plants
Littoral Zone Populations
15. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition
Ecological Succession
Food Chain
Hydrosphere
Thundra Animals
16. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active
Photic Zone animals
Community
Poikilothermic (Cold Blooded)
Temperate Deciduous Forest Biome
17. 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
Biotic Environment
Desert Plants
Nitrogen Cycle 3
18. Encompasses all that is external to the organism and is necessary for its existence
Tropical Rain Forest Plants
Photic zone
Environment
Temperate Deciduous Forest Biome
19. Algae - sponges - clams - snails - sea urchins - starfish - and crabs
Biosphere
Dentrified
Intertidal Zone Population
Competition Same Niche 3
20. Includes climate - temperature - availability of light and water - and the local topology
Autotrophs
Abiotic (Physical) Environment
Grassland Biome
Poikilothermic (Cold Blooded)
21. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms
Material Cycles
Substratum (soil/rock)
Species
Saprophytes
22. Composed of populations that are able to exist under the new conditions
Commensalism
Niche
Scavengers
Successive Communities
23. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles
Successive Communities
Carbon Cycle 1
Biotic Community
Organism
24. Community in an ecological succession is identified by a dominant species
Nekton
Successive Communities
Climax Community
Sere
25. Rhododendrons and pines are more suited for growth in acid oil
Polar Region
Desert animals
Primary Consumers
Substratum-pH
26. 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
Food Web
Carnivores
Poikilothermic (Cold Blooded)
Niche
27. Includes the community and the environment and usually all five kingdoms
Herbivores
Pelagic Zone
Ecosystem
Nitrogen Cycle 4
28. 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
Food Pyramids
Temperate Coniferous Forest Biome
Carbon Cycle 2
Desert Plants
29. Consists of populations of different plants and animal species interacting with each other in a given environment
Communities
Competition
Biotic Community
Aphotic Zone
30. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem
Saprophytes
Ecosystem
Species
Biosphere
31. Freshwater Biomes vs. Saltwater 3: Freshwater biomes - except very large lakes - are affected by variations in _________. temperature of freshwater bodies varies considerably; they may freeze or dry up - and mud from their floors may be stirred up by
Pelagic Zone
Mutualims
Climate and weather
Saprophytes
32. Determine by the amount of decaying plant and animal life in the soil
Climax Community
Substratum-Humus
Nitrogen cycle 1
Competition Same Niche
33. Polar bears - musk oxen - and arctic hens
Pelagic Zone
Intraspecific Interactions
Thundra Animals
Photic zone
34. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures
Desert animals
Second Law of Thermodynamics
Organism
Hydrosphere
35. Animals that consume dead animals
Substratum-Minerals
Scavengers
Nitrogen Cycle 2
Taiga Plants
36. Conserve water actively
Pyramid of Mass
Second Law of Thermodynamics
Competition Same Niche
Desert Plants
37. Evolve toward a balance in which the predator is a regulatory influence on th prey but not a threat to its survival
Aphotic Zone
Predator-Prey relationship
Heterotrophs
Parasitism
38. The major component of the internal environment of all living things
Physical Environment- Water
Temperate Deciduous Forest Animals
Thundra Animals
Saprophytes
39. Animals that consume only plants or plant foods
Marine Biomes
Herbivores
Nitrogen Cycle 5
Conditions for stability in an Ecosystem
40. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds
Decomposer
Temperate Deciduous Forest Animals
Taiga Animals
Abiotic (Physical) Environment
41. The ultimate source of energy for all organisms
Physical Environment-Sunlight
Hemeothermic (Warm Blooded)
Taiga Animals
Intertidal Zone Population
42. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria
Epiphytes
Photic Zone animals
Nitrified
Predator-Prey relationship
43. 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
Nitrogen Cycle 3
Physical Environment-Temperature
Intraspecific Interactions
Carbon Cycle 3
44. Nekton and benthos - scavengers - and predators (fiercely competitive)
Symbionts
Polar Region
Aphotic Zone animals
Ecosystem
45. 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
Niche
Abiotic (Physical) Environment
Epiphytes
Desert Biome
46. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms
Lithosphere
Nitrogen
Heterotrophs
Biotic Environment
47. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place
Photic Zone
Benthos
Marine Biomes
Obligatory
48. Used to include only the population and not their physical environment
Primary Consumers
Nekton
Biotic Community
Pelagic Zone
49. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor
Intraspecific Interactions
Temperate Deciduous Forest Animals
Carbon Cycle 2
Epiphytes
50. When a parasite benefits at the expense of the host
Parasitism
Biosphere
Photic Zone animals
Benthos