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






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






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






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






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






6. Adaptations for maintaining their internal osmolarity and conserving water






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






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






9. 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






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






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






12. 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






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






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






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






16. Animals that feed on secondary consumer






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






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






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






20. 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






21. Free-living organisms that feed on other living organisms






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






23. Conserve water actively






24. Only animal life and other heterotrophic life exists






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






26. 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






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






28. 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






29. Polar bears - musk oxen - and arctic hens






30. Animals that consume green plants (herbivores)






31. 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






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






33. Two species may rapidly evolve in divergent directions under the strong selection pressure resulting from intense competition. thus - the two species would rapidly evolve greater differences in their niches






34. 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






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






36. The study of interactions between organisms and their environment






37. 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






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






39. 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






40. One species may be competitively superior in some regions - and the other may be superior in other regions under different environmental conditions. this would result in the elimination of one species in some places and the other in other places






41. Organisms that manufacture their own food






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






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






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






45. The chief disruptive force






46. Crawling and sessile organsms






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






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






49. The oceans






50. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem







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