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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. Vegetation such as vines and eppiphytes






2. Rock and soil surface






3. Include reproduction and protection from predators and destructive weather






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






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






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






7. Adaptations for maintaining their internal osmolarity and conserving water






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






9. The ultimate source of energy for all organisms






10. 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






11. Animals that consume only plants or plant foods






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






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






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






15. 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






16. 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






17. Freshwater Biomes vs. Saltwater 3: Freshwater biomes - except very large lakes - are affected by variations in _________. temperature of freshwater bodies varies considerably; they may freeze or dry up - and mud from their floors may be stirred up by






18. Regiong beneatht he photic zone that receives no light






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






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






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






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






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






24. Polar bears - musk oxen - and arctic hens






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






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






27. 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






28. 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






29. 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






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






31. 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






32. Conserve water actively






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






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






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






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






37. Algae - sponges - clams - snails - sea urchins - starfish - and crabs






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






39. Lichens and moss






40. Only animal life and other heterotrophic life exists






41. 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






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






43. Any group of similar organisms that are capable of reproducing






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






45. The chief disruptive force






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






47. The oceans






48. Animals that eat both plants and animals






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






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






Can you answer 50 questions in 15 minutes?



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