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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. 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






2. 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






3. 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






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






5. Animals that consume primary consumers (carnivores)






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






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






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






9. Include saprophytic organisms and organisms of decay






10. Distinct community in a geographic region






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






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






13. 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






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






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






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






17. 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






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






19. Recycle water - oxygen - and phosphorus






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






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






22. Determined by the same decisive factors-temperatures and rainfall






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






24. 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






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






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






27. The chief disruptive force






28. 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






29. The study of interactions between organisms and their environment






30. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels






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






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






33. Regiong beneatht he photic zone that receives no light






34. Include reproduction and protection from predators and destructive weather






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






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






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






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






39. 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






40. Polar bears - musk oxen - and arctic hens






41. Deer - fox - woodchuck - and squirrel






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






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






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






45. 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






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






47. Only animal life and other heterotrophic life exists






48. The metabolically produced CO2 is released to the air. The rest of the orgnaic carbon remains locked whthin an organism until its death (except for wastes given off) - at which time decay processes by bacteria return the CO2 to the air






49. 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






50. Animals that consume dead animals







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