Test your basic knowledge |

PCAT Biology Ecology

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. The oceans






2. Consists of populations of different plants and animal species interacting with each other in a given environment






3. When a parasite benefits at the expense of the host






4. One that exerts control over the other species that are present






5. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels






6. Food chain is not a simple linear chain but an intricate web






7. Symbiotic relationship from which both organisms derive some benefit






8. One or both organisms can't survive without the other






9. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids






10. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe






11. Have adaptations enabling them to survive in very cod water - with high pressures - and in complete darkness






12. Sunlit layer of the open sea extending to a depth of 250-600ft






13. 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






14. Frozen area with no vegetation and terrestrial animals -animals that do inhabit polar regions generally live near the polar oceans






15. The ultimate source of energy for all organisms






16. Polar bears - musk oxen - and arctic hens






17. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles






18. 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






19. Integrated system of species that are dependent upon one another for survival






20. Rhododendrons and pines are more suited for growth in acid oil






21. An essential component of amino acids and nucleic acids - which are the building blocks of all living things






22. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food






23. Determined by the same decisive factors-temperatures and rainfall






24. Animals that eat both plants and animals






25. 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






26. Forest floors contain moss and lichens






27. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms






28. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die






29. Active swimmers such as fish - sharks - or whales that feed on plankton and smaller fish






30. Group of organisms of the same species living together in a given location






31. The major component of the internal environment of all living things






32. Affect the type of vegetation that can be supported






33. 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






34. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere






35. Conserve water actively






36. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins






37. Needs constant energy source and cycling of materials between the living system






38. Encompasses all that is external to the organism and is necessary for its existence






39. Vegetation has evolved adaptations for water conservation such as needle shaped leaves






40. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae






41. Trees such as beech - maple - oaks - and willows shed their leaves during cold winters months






42. 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






43. Deer - fox - woodchuck - and squirrel






44. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds






45. Distinct community in a geographic region






46. Animals that consume green plants (herbivores)






47. 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






48. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants






49. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down






50. The chief disruptive force