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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. Algae - crabs - crustacea - and many different species of fish






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






3. Animals that eat both plants and animals






4. Animals that consume only plants or plant foods






5. Defines the functional role of an organism in its ecosystem -described what the organism eats - where and how it obtains its food - what climatic factors it can tolerate and which are optimal - the nature of its parasites and predators - where and ho






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






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






8. The study of interactions between organisms and their environment






9. 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






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






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






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






13. 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






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






15. 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






16. Developed long legs and many are hoofed






17. Evolve toward a balance in which the predator is a regulatory influence on th prey but not a threat to its survival






18. 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






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






20. 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






21. The oceans






22. 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






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






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






25. Include reproduction and protection from predators and destructive weather






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






27. Animals that feed on secondary consumer






28. Animals that consume primary consumers (carnivores)






29. 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






30. Links between oceans and land






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






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






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






34. Receive less than ten inches of rain each year; the rain is concentrated within a few heavy cloudbursts -ex: Sahara in Africa and Gobi in Asia






35. Determines water holding capacity






36. Affect the type of vegetation that can be supported






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






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






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






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






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






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






43. Crawling and sessile organsms






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






45. Vegetation such as vines and eppiphytes






46. 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






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






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






49. 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






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







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