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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. 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






2. 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






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






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






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






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






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






8. When one organism is benefited by the association and the other is not affected






9. 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






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






11. 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






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






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






14. Conserve water actively






15. 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






16. 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






17. Deer - fox - woodchuck - and squirrel






18. Regiong beneatht he photic zone that receives no light






19. Crawling and sessile organsms






20. 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






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






22. First to resettle a virgin area






23. 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






24. Affect the type of vegetation that can be supported






25. Lichens and moss






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






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






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






29. Recycle water - oxygen - and phosphorus






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






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






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






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






34. Forest floors contain moss and lichens






35. 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






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






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






38. 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






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






40. 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






41. Adaptations for maintaining their internal osmolarity and conserving water






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






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






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






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






46. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms






47. The study of interactions between organisms and their environment






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






49. Animals that consume primary consumers (carnivores)






50. 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