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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 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






2. 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






3. Deer - fox - woodchuck - and squirrel






4. Developed long legs and many are hoofed






5. 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






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






7. Without a constant input of energy from the sun - an ecosystem would soon run down - as food is transferred from one level of the food chain to the next - a transfer of energy occurs






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






9. Conserve water actively






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






11. Determines water holding capacity






12. 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






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






14. 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






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






16. Recycle water - oxygen - and phosphorus






17. Forest floors contain moss and lichens






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






19. Animals that feed on secondary consumer






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






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






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






23. Vegetation such as vines and eppiphytes






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






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






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






27. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids






28. 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






29. Rhododendrons and pines are more suited for growth in acid oil






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






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






32. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion






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






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






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






36. 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






37. 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






38. Individuals belonging to the same species use the same resources and if a particular resource is limited - then these organisms must compete with one another






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






40. Polar bears - musk oxen - and arctic hens






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






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






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






44. Animals that consume dead animals






45. Animals that consume only plants or plant foods






46. 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






47. Include reproduction and protection from predators and destructive weather






48. 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






49. Crawling and sessile organsms






50. Organisms that manufacture their own food