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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. 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






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






3. Recycle water - oxygen - and phosphorus






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






5. Animals that consume primary consumers (carnivores)






6. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat






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






8. 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






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






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






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






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






13. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes






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






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






16. Animals that consume dead animals






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






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






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






20. Two fates await the ammonia (NH3). some are nitrified or dentrified






21. Lichens and moss






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






23. 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






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






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






26. Distinct community in a geographic region






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






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






29. Deer - fox - woodchuck - and squirrel






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






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






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






33. Animals that eat both plants and animals






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






35. 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






36. First to resettle a virgin area






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






38. 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






39. 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






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






41. Rivers - lakes - ponds - and marshes






42. Only animal life and other heterotrophic life exists






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






44. Adaptations for maintaining their internal osmolarity and conserving water






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






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






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






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






49. Animals that consume only plants or plant foods






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







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