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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. Forest floors contain moss and lichens






3. Only animal life and other heterotrophic life exists






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






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






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






7. Includes the community and the environment and usually all five kingdoms






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






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






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






11. Distinct community in a geographic region






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






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






14. 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






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






16. The oceans






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






18. 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






19. The ultimate source of energy for all organisms






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






21. 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






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






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






24. Elemental nitrogen is chemically inert and cannot be used by most organisms. Lightning and nitrogen-fixing bacteria in the roots of legumes change the nitrogen into the usable - soluble nitrates






25. Lichens and moss






26. Regiong beneatht he photic zone that receives no light






27. Determines water holding capacity






28. Include saprophytic organisms and organisms of decay






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






30. Links between oceans and land






31. 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






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






33. Animals that consume primary consumers (carnivores)






34. Crawling and sessile organsms






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






36. 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






37. Trees such as beech - maple - oaks - and willows shed their leaves during cold winters months






38. Symbiotic relationship from which both organisms derive some benefit






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






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






41. Conserve water actively






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






43. The chief disruptive force






44. The study of interactions between organisms and their environment






45. 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






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






47. Developed long legs and many are hoofed






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






49. Used to include only the population and not their physical environment






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