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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. 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






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






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






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






5. Recycle water - oxygen - and phosphorus






6. 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






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






8. Conserve water actively






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






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






11. 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






12. Regiong beneatht he photic zone that receives no light






13. Rock and soil surface






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






15. 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






16. 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






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






18. Animals that consume dead animals






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






20. Crawling and sessile organsms






21. Only animal life and other heterotrophic life exists






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






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






24. 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






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






26. Deer - fox - woodchuck - and squirrel






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






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






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. Animals that consume green plants (herbivores)






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






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






33. The chief disruptive force






34. 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






35. 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






36. Because organisms at the upper levels of the food chain derive their food energy from organisms at lower levels - and because energy is lost from one level to the next - each level can support a successively smaller biomass






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






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






39. 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






40. Each member of a food chain uses some of the energy it obtains from its food for its own metabolism and loses some additional energy in the form of heat






41. More than 70% of earth -plants have little controlling influence in communities -most stable ecosystems; the conditions affecting temperature - amount of available oxygen and cabon dioxide - and amount of suspended or dissolve materials are very stab






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






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






44. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures






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






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






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






48. Developed long legs and many are hoofed






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






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