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






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






3. Adaptations for maintaining their internal osmolarity and conserving water






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






5. 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






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






7. 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






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






9. Animals that consume primary consumers (carnivores)






10. 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






11. Affect the type of vegetation that can be supported






12. 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






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






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






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






16. Gaseous CO2 enters the living world when plants use it to produce glucose via photosynthesis. The carbon atoms in CO2 are bonded to hydrogen and other carbon atoms. the plant uses the glucose to make starch - proteins - and fat






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






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






19. Forest floors contain moss and lichens






20. 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






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






22. 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






23. The oceans






24. Animals that feed on secondary consumer






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






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






27. Lichens and moss






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






29. 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






30. Determines the nature of plant and animal life in the soil






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






32. 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






33. Vegetation such as vines and eppiphytes






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






35. Symbiotic relationship from which both organisms derive some benefit






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






37. 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






38. Every energy transfer involves a loss of energy and each level of the food chain uses some of the energy it obtains from the food for its own metabolism and loses some additional energy in the form of heat






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






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






41. The ultimate source of energy for all organisms






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






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






44. Animals that consume only plants or plant foods






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






46. Rock and soil surface






47. Polar bears - musk oxen - and arctic hens






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






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






50. Cold - dry - and inhabited by fir - pine - and spruce trees -much vegetation has evolved adaptations for water conservation such as needle-shaped leaves -Extreme Northern Part of the US and in Southern Canada







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