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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. Rock and soil surface






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






3. Two fates await the ammonia (NH3). some are nitrified or dentrified






4. 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






5. Vegetation such as vines and eppiphytes






6. 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






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






8. Community in an ecological succession is identified by a dominant species






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






10. Lichens and moss






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






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






13. 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






14. 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






15. 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






16. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles






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






18. The oceans






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






20. Animals that consume dead animals






21. Gaseous CO2 enters the living world when plants use it to produce glucose via photosynthesis. The carbon atoms in CO2 are bonded to hydrogen and other carbon atoms. the plant uses the glucose to make starch - proteins - and fat






22. Group of organisms of the same species living together in a given location






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






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






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






26. 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






27. Affect the type of vegetation that can be supported






28. Recycle water - oxygen - and phosphorus






29. Organisms that manufacture their own food






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






31. Symbiotic relationship from which both organisms derive some benefit






32. The ultimate source of energy for all organisms






33. Developed long legs and many are hoofed






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






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






36. 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






37. Include saprophytic organisms and organisms of decay






38. 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






39. The study of interactions between organisms and their environment






40. Animals that feed on secondary consumer






41. 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






42. 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






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






44. Jungles characterized by high temperatures and torrential rains -found in Central Africa - Central America - the Amazon basic - and Southeast Asia






45. Characterized by low rainfall - although considerably more than the desert biomes receive -provide no shelter for herbivorous mammals from carnivorous predators -ex: East of the Rockies - steppes of the Ukraine - and the pampas of Argentina






46. Forest floors contain moss and lichens






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






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






49. Only animal life and other heterotrophic life exists






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