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






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






3. Recycle water - oxygen - and phosphorus






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






5. 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






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






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






9. 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






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






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






12. Only animal life and other heterotrophic life exists






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






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






15. Rock and soil surface






16. Include saprophytic organisms and organisms of decay






17. 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






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






19. 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






20. 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






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






22. Developed long legs and many are hoofed






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






24. The ultimate source of energy for all organisms






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






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






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






28. 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






29. The chief disruptive force






30. Polar bears - musk oxen - and arctic hens






31. Determines the nature of plant and animal life in the soil






32. Lichens and moss






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






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






35. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die






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






37. Animals that consume dead animals






38. 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






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






40. 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






41. 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






42. 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






43. The oceans






44. 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






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






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






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






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






49. Determines water holding capacity






50. When a parasite benefits at the expense of the host