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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 - sponges - clams - snails - sea urchins - starfish - and crabs






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






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






4. Deer - fox - woodchuck - and squirrel






5. 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






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






7. 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






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






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






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






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






12. Crawling and sessile organsms






13. Organisms that manufacture their own food






14. Animals that consume dead animals






15. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem






16. Regiong beneatht he photic zone that receives no light






17. First to resettle a virgin area






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






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






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






21. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down






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






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






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






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






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






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






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






29. Links between oceans and land






30. The study of interactions between organisms and their environment






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






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






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






34. 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






35. Animals that consume primary consumers (carnivores)






36. Distinct community in a geographic region






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






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






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






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






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






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






43. 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






44. 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






45. The oceans






46. Conserve water actively






47. Rock and soil surface






48. Animals that consume only plants or plant foods






49. Animals that eat both plants and animals






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