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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
Rootlike holdfasts
Nitrogen cycle 1
Competition
Parasitism
2. Includes the community and the environment and usually all five kingdoms
Climate and weather
Ecosystem
Niche
Grassland Animals
3. Encompasses all that is external to the organism and is necessary for its existence
Decomposer
Aphotic Zone
Marshes
Environment
4. Affect the type of vegetation that can be supported
Temperate Deciduous Forest Biome
Nekton
Substratum-Minerals
Parasitism
5. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition
Conditions for stability in an Ecosystem
Competition Same Niche
Food Chain
Competition Same Niche 3
6. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes
Pyramid of Energy
Niche
Physical Environment- Water
Physical Environment-Temperature
7. Deer - fox - woodchuck - and squirrel
Ecology
Temperate Deciduous Forest Animals
Pelagic Zone
Nitrogen Cycle 4
8. Determined by the same decisive factors-temperatures and rainfall
Nature of Biomes
Omnivores
Tundra Plants
Intertidal Zone
9. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms
Parasitism
Material Cycles
Grassland Animals
Deep-sea Organisms
10. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food
Heterotrophs
Thundra Animals
Carbon Cycle 3
Substratum-Humus
11. Animals that feed on secondary consumer
Tertiary Consumers
Competition Same Niche 3
Physical Environment-Temperature
Environmental Factors
12. The vegetation that becomes dominant and stable after years of evolutiionary development
Intertidal Zone
Freshwater Biomes
Food Chain
Coimax Vegetatioin
13. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor
Aphotic Zone
Epiphytes
Biome
Benthos
14. Community in an ecological succession is identified by a dominant species
Nitrogen Cycle 3
Rootlike holdfasts
Hemeothermic (Warm Blooded)
Sere
15. Freshwater Biomes vs. Saltwater 1: Freshwater is _______________ which results in the passage of water into the cell. Freshwater organisms have homeostatic mechanisms to maintain water balance by the regular removal of the excess water. these include
Temperate Coniferous Forest Biome
Parasitism
Hypotonic
Osmoregulation
16. Active swimmers such as fish - sharks - or whales that feed on plankton and smaller fish
Nekton
Ecosystem
Competition Same Niche
Rootlike holdfasts
17. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae
Obligatory
Nitrogen Cycle 5
Producers
Photic Zone animals
18. 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
Intraspecific Interactions
Biotic Community
Pelagic Zone
Tropical Rain Forest Plants
19. Needs constant energy source and cycling of materials between the living system
Niche
Biotic Community
Conditions for stability in an Ecosystem
Freshwater Biomes
20. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down
Competition Same Niche
Pyramid of Numbers
Substratum-pH
Taiga Biome
21. The orderly process by which one biotic community replaces or succeeds another until a climax community is established
Tropical Rain Forest Animals
Ecological Succession
Nitrogen Cycle 5
Material Cycles
22. Frozen area with no vegetation and terrestrial animals -animals that do inhabit polar regions generally live near the polar oceans
Substratum-pH
Ecosystem
Polar Region
Freshwater Biomes
23. Regiong beneatht he photic zone that receives no light
Second Law of Thermodynamics
Decomposer
Temperate Deciduous Forest Biome
Aphotic Zone
24. Organisms that manufacture their own food
Substratum-texture
Desert animals
Polar Region
Autotrophs
25. 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
Pyramid of Mass
Autotrophs
Competition
Competition Same Niche 2
26. The nitrogen locked up in the wastes and dead tissues is released by the action of the bacteria of decay - which convert the proteins into ammonia
Taiga Biome
Dominant Species
Nitrogen Cycle 4
Niche
27. Forest floors contain moss and lichens
Carbon Cycle 1
Tropical Rain Forest Plants
Taiga Plants
Nature of Biomes
28. Recycle water - oxygen - and phosphorus
Tertiary Consumers
Physical Environment- Water
Other Cycles
Population
29. 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
Hydrosphere
Grassland Biome
Communities
Thundra Animals
30. Nekton and benthos - scavengers - and predators (fiercely competitive)
Hypotonic
Aphotic Zone animals
Substratum-Humus
Dominant Species
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
Scavengers
Physical Environment- Water
Littoral Zone
Tundra Biome
32. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles
Desert Plants
Material Cycles
Biotic Community
Organism
33. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants
Substratum-Humus
Biosphere
Aquatic Biomes
Symbionts
34. Lichens and moss
Omnivores
Benthos
Tundra Plants
Climate and weather
35. 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
Nitrified
Pyramid of Energy
Nitrogen Cycle 2
36. 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
Pelagic Zone
Population
Predator-Prey relationship
Food Pyramids
37. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere
Biosphere
Nitrified
Photic zone
Intertidal Zone
38. Developed long legs and many are hoofed
Grassland Animals
Ecology
Omnivores
Dominant Species
39. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids
Substratum-pH
Ecology
Tropical Rain Forest Plants
Producers
40. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat
Successive Communities
Nitrogen Cycle 5
Marine Biomes
Pioneer Organism
41. Vegetation such as vines and eppiphytes
Tropical Rain Forest Plants
Climax Community
Temperate Deciduous Forest Biome
Taiga Animals
42. One species may be competitively superior to the other and drive the second to extinction
Herbivores
Pyramid of Numbers
Conditions for stability in an Ecosystem
Competition Same Niche
43. Animals that eat both plants and animals
Niche
Substratum-Humus
Heterotrophs
Omnivores
44. 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
Poikilothermic (Cold Blooded)
Dominant Species
Saprophytes
45. Rock and soil surface
Tundra Biome
Osmoregulation
Abiotic (Physical) Environment
Lithosphere
46. Any group of similar organisms that are capable of reproducing
Species
Dentrified
Biotic Community
Temperate Deciduous Forest Biome
47. The study of interactions between organisms and their environment
Tundra Plants
Ecology
Cohesive Force
Dentrified
48. First to resettle a virgin area
Physical Environment-Sunlight
Osmoregulation
Intertidal Zone Population
Pioneer Organism
49. 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
Successive Communities
Desert Biome
Communities
50. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes
Littoral Zone
Substratum-texture
Nitrified
Tropical Rain Forest Animals