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






2. 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






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






4. First to resettle a virgin area






5. The oceans






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






7. 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






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






9. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe






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






11. Only animal life and other heterotrophic life exists






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






13. 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






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






15. The study of interactions between organisms and their environment






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






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






18. Regiong beneatht he photic zone that receives no light






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






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. Determine by the amount of decaying plant and animal life in the soil






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






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






24. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment






25. Polar bears - musk oxen - and arctic hens






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






27. 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






28. Animals that consume dead animals






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






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






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






32. Organisms that manufacture their own food






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






34. Rock and soil surface






35. Developed long legs and many are hoofed






36. Animals that feed on secondary consumer






37. 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






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






39. Forest floors contain moss and lichens






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






41. Lichens and moss






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






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






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






45. 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






46. Algae - sponges - clams - snails - sea urchins - starfish - and crabs






47. 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






48. 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






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






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