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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. Symbiotic relationship from which both organisms derive some benefit






2. 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






3. 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






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






5. The study of interactions between organisms and their environment






6. Animals that consume primary consumers (carnivores)






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






8. Region typical of the open seas and can be divided into photic and aphotic zones






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






10. 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






11. Recycle water - oxygen - and phosphorus






12. Developed long legs and many are hoofed






13. Crawling and sessile organsms






14. Links between oceans and land






15. 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






16. 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






17. Distinct community in a geographic region






18. 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






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






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






21. Freshwater Biomes vs. Saltwater 1: Freshwater is _______________ which results in the passage of water into the cell. Freshwater organisms have homeostatic mechanisms to maintain water balance by the regular removal of the excess water. these include






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






23. Deer - fox - woodchuck - and squirrel






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






25. 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






26. Lichens and moss






27. 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






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






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






30. Vegetation such as vines and eppiphytes






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






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






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






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






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






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






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






38. Forest floors contain moss and lichens






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






40. 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






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






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






43. Food chain is not a simple linear chain but an intricate web






44. Rock and soil surface






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






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






48. 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






49. Freshwater Biomes vs. Saltwater 2: In rivers and streams - strong swift currents exist - and thus fish that have developed strong muscles and plants with _____________ have survived






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