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






2. Crawling and sessile organsms






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






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






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






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






7. Affect the type of vegetation that can be supported






8. Without a constant input of energy from the sun - an ecosystem would soon run down - as food is transferred from one level of the food chain to the next - a transfer of energy occurs






9. 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






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






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






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






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






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






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






16. Conserve water actively






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






18. 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






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






20. Deer - fox - woodchuck - and squirrel






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






22. Animals that consume dead animals






23. 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






24. Organisms that manufacture their own food






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






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






27. Include reproduction and protection from predators and destructive weather






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






29. Vegetation such as vines and eppiphytes






30. The oceans






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






32. Developed long legs and many are hoofed






33. Only animal life and other heterotrophic life exists






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






35. Defines the functional role of an organism in its ecosystem -described what the organism eats - where and how it obtains its food - what climatic factors it can tolerate and which are optimal - the nature of its parasites and predators - where and ho






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






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






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






39. First to resettle a virgin area






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






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






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






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






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






45. Recycle water - oxygen - and phosphorus






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






47. Animals that consume only plants or plant foods






48. Lichens and moss






49. 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






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