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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. The chief disruptive force






2. Forest floors contain moss and lichens






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






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






5. Rivers - lakes - ponds - and marshes






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






7. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active






8. Algae - crabs - crustacea - and many different species of fish






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






10. 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






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






12. The oceans






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






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






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






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






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






18. Jungles characterized by high temperatures and torrential rains -found in Central Africa - Central America - the Amazon basic - and Southeast Asia






19. Developed long legs and many are hoofed






20. 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






21. Adaptations for maintaining their internal osmolarity and conserving water






22. Animals that consume primary consumers (carnivores)






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






24. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria






25. 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






26. Animals that eat both plants and animals






27. Determines water holding capacity






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






29. Links between oceans and land






30. Freshwater Biomes vs. Saltwater 2: In rivers and streams - strong swift currents exist - and thus fish that have developed strong muscles and plants with _____________ have survived






31. Includes the community and the environment and usually all five kingdoms






32. 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






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






34. Vegetation such as vines and eppiphytes






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






36. Lichens and moss






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






38. First to resettle a virgin area






39. Composed of populations that are able to exist under the new conditions






40. Regiong beneatht he photic zone that receives no light






41. The study of interactions between organisms and their environment






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






43. The ultimate source of energy for all organisms






44. Deer - fox - woodchuck - and squirrel






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






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






47. 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






48. Algae - sponges - clams - snails - sea urchins - starfish - and crabs






49. Animals that feed on secondary consumer






50. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes