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






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






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






4. 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






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






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






7. Include reproduction and protection from predators and destructive weather






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






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






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






11. Organisms that manufacture their own food






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






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






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






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






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






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






18. 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






19. 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






20. Links between oceans and land






21. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms






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






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






24. More than 70% of earth -plants have little controlling influence in communities -most stable ecosystems; the conditions affecting temperature - amount of available oxygen and cabon dioxide - and amount of suspended or dissolve materials are very stab






25. Animals eat plants and use the digested nutrients to form carbohydrates - fats - and proteins characteristic of the species. a part of these organic compounds is used as fuel in respiration in plants and animals






26. Animals that consume dead animals






27. Symbiotic relationship from which both organisms derive some benefit






28. Polar bears - musk oxen - and arctic hens






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






30. Recycle water - oxygen - and phosphorus






31. 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






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






33. The chief disruptive force






34. Affect the type of vegetation that can be supported






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






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






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






38. Crawling and sessile organsms






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






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






41. Lichens and moss






42. An essential component of amino acids and nucleic acids - which are the building blocks of all living things






43. Only animal life and other heterotrophic life exists






44. Animals that consume primary consumers (carnivores)






45. Forest floors contain moss and lichens






46. Animals that consume green plants (herbivores)






47. 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






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






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






50. Rivers - lakes - ponds - and marshes







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