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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. 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
Temperate Coniferous Forest Biome
Nitrogen cycle 1
Nitrogen Cycle 4
Grassland Biome
2. 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
Ecology
Grassland Biome
Commensalism
Tropical Rain Forest Plants
3. Trees such as beech - maple - oaks - and willows shed their leaves during cold winters months
Intertidal Zone Population
Nitrogen
Tertiary Consumers
Temperate Deciduous Forest Plants
4. Forest floors contain moss and lichens
Taiga Plants
Carbon Cycle 3
Competition Same Niche 3
Epiphytes
5. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants
Nitrogen Cycle 3
Taiga Animals
Species
Symbionts
6. Consists of populations of different plants and animal species interacting with each other in a given environment
Lithosphere
Competition Same Niche 3
Competition Same Niche 2
Communities
7. The chief disruptive force
Competition
Hypotonic
Population
Successive Communities
8. The study of interactions between organisms and their environment
Ecology
Aphotic Zone
Food Web
Pyramid of Energy
9. Region exposed to low tides that undergoes variations in temperature and periods of dryness
Intertidal Zone
Decomposer
Grassland Biome
Photic zone
10. 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
Food Chain
Ecosystem
Sere
Taiga Biome
11. 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
Pyramid of Energy
Second Law of Thermodynamics
Organism
Lithosphere
12. Deer - fox - woodchuck - and squirrel
Material Cycles
Temperate Deciduous Forest Animals
Nitrogen Cycle 2
Decomposer
13. 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
Successive Communities
Epiphytes
Substratum-texture
Pyramid of Mass
14. Vegetation has evolved adaptations for water conservation such as needle shaped leaves
Successive Communities
Thundra Animals
Biotic Community
Temperate Coniferous Plants
15. Jungles characterized by high temperatures and torrential rains -found in Central Africa - Central America - the Amazon basic - and Southeast Asia
Tropical Rain Forest Biome
Abiotic (Physical) Environment
Food Chain
Population
16. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe
Abiotic (Physical) Environment
Marine Biomes
Temperate Deciduous Forest Biome
Desert Biome
17. 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
Climate and weather
Substratum-Minerals
Temperate Deciduous Forest Animals
Secondary Consumers
18. Animals that feed on secondary consumer
Photic Zone
Substratum (soil/rock)
Second Law of Thermodynamics
Tertiary Consumers
19. Crawling and sessile organsms
Competition Same Niche 2
Benthos
Secondary Consumers
Biome
20. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms
Abiotic (Physical) Environment
Symbionts
Nitrified
Biotic Environment
21. Include saprophytic organisms and organisms of decay
Pyramid of Energy
Taiga Biome
Cohesive Force
Decomposer
22. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes
Tropical Rain Forest Animals
Nitrified
Population
Lithosphere
23. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat
Other Cycles
Nitrogen
Marine Biomes
Ecological Succession
24. 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
Temperate Coniferous Forest Biome
Aphotic Zone
Competition Same Niche 2
Physical Environment-Temperature
25. The orderly process by which one biotic community replaces or succeeds another until a climax community is established
Food Chain
Temperate Deciduous Forest Biome
Marshes
Ecological Succession
26. Adaptations for maintaining their internal osmolarity and conserving water
Ecological Succession
Osmoregulation
Organism
Grassland Animals
27. Animals that consume only plants or plant foods
Taiga Biome
Intertidal Zone Population
Herbivores
Food Web
28. Includes the community and the environment and usually all five kingdoms
Heterotrophs
Dominant Species
Pioneer Organism
Ecosystem
29. 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
Symbionts
Dentrified
Saprophytes
30. Organisms that manufacture their own food
Temperate Deciduous Forest Plants
Autotrophs
Community
Aphotic Zone
31. Community in an ecological succession is identified by a dominant species
Mutualims
Sere
Carbon Cycle 3
Osmoregulation
32. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor
Epiphytes
Hemeothermic (Warm Blooded)
Biome
Benthos
33. 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
Carnivores
Population
Heterotrophs
Nitrogen
34. 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
Obligatory
Desert Biome
Food Chain
Hypotonic
35. When one organism is benefited by the association and the other is not affected
Carbon Cycle 2
Desert animals
Community
Commensalism
36. Determined by the same decisive factors-temperatures and rainfall
Primary Consumers
Nature of Biomes
Community
Desert animals
37. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures
Second Law of Thermodynamics
Coimax Vegetatioin
Desert animals
Saprophytes
38. 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
Temperate Deciduous Forest Plants
Food Web
Saprophytes
Community
39. When a parasite benefits at the expense of the host
Parasitism
Grassland Animals
Nitrogen
Tundra Biome
40. The vegetation that becomes dominant and stable after years of evolutiionary development
Producers
Species
Food Pyramids
Coimax Vegetatioin
41. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae
Temperate Deciduous Forest Animals
Photic Zone animals
Nitrogen Cycle 5
Taiga Animals
42. Active swimmers such as fish - sharks - or whales that feed on plankton and smaller fish
Aphotic Zone
Physical Environment-Temperature
Nitrogen Cycle 3
Nekton
43. Group of organisms of the same species living together in a given location
Grassland Biome
Tropical Rain Forest Biome
Population
Desert Biome
44. The major component of the internal environment of all living things
Food Chain
Tropical Rain Forest Plants
Physical Environment- Water
Polar Region
45. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active
Tropical Rain Forest Biome
Pyramid of Energy
Other Cycles
Poikilothermic (Cold Blooded)
46. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels
Biosphere
Hemeothermic (Warm Blooded)
Autotrophs
Environmental Factors
47. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes
Biome
Deep-sea Organisms
Physical Environment-Temperature
Scavengers
48. Symbiotic relationship from which both organisms derive some benefit
Substratum-Humus
Carbon Cycle 3
Mutualims
Photic Zone animals
49. 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
Photic Zone animals
Conditions for stability in an Ecosystem
Tundra Biome
Dominant Species
50. Needs constant energy source and cycling of materials between the living system
Dominant Species
Desert animals
Primary Consumers
Conditions for stability in an Ecosystem