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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. Polar bears - musk oxen - and arctic hens






2. The orderly process by which one biotic community replaces or succeeds another until a climax community is established






3. Includes climate - temperature - availability of light and water - and the local topology






4. Animals that eat both plants and animals






5. 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






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






7. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition






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






9. 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






10. Animals eat plants and use the digested nutrients to form carbohydrates - fats - and proteins characteristic of the species. a part of these organic compounds is used as fuel in respiration in plants and animals






11. Community in an ecological succession is identified by a dominant species






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






13. 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






14. Crawling and sessile organsms






15. Region exposed to low tides that undergoes variations in temperature and periods of dryness






16. One species may be competitively superior to the other and drive the second to extinction






17. The ultimate source of energy for all organisms






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






19. Rock and soil surface






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






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






22. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor






23. Animals that consume dead animals






24. 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






25. 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






26. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place






27. Any group of similar organisms that are capable of reproducing






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. Region on the continental shelf that contains ocean area with depths up to 600 feet and extends several hundred miles from the shores






30. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying






31. Evolve toward a balance in which the predator is a regulatory influence on th prey but not a threat to its survival






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






33. Region typical of the open seas and can be divided into photic and aphotic zones






34. The chief disruptive force






35. Recycle water - oxygen - and phosphorus






36. Symbiotic relationship from which both organisms derive some benefit






37. The vegetation that becomes dominant and stable after years of evolutiionary development






38. Include saprophytic organisms and organisms of decay






39. Nekton and benthos - scavengers - and predators (fiercely competitive)






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






41. The oceans






42. Free-living organisms that feed on other living organisms






43. Include reproduction and protection from predators and destructive weather






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






45. 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






46. Organisms that manufacture their own food






47. Regiong beneatht he photic zone that receives no light






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






49. 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






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







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