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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. 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






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






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






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






5. Deer - fox - woodchuck - and squirrel






6. 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






7. Polar bears - musk oxen - and arctic hens






8. Crawling and sessile organsms






9. Distinct community in a geographic region






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






11. 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






12. Affect the type of vegetation that can be supported






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






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






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






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






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






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






19. Adaptations for maintaining their internal osmolarity and conserving water






20. The chief disruptive force






21. Symbiotic relationship from which both organisms derive some benefit






22. 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






23. Animals that feed on secondary consumer






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






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






26. Developed long legs and many are hoofed






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






28. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down






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






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






31. Animals that eat both plants and animals






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






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






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






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






36. Animals that consume dead animals






37. Only animal life and other heterotrophic life exists






38. The oceans






39. First to resettle a virgin area






40. 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






41. 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






42. 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






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






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






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






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






47. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes






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






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






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