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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. The oceans






2. Animals that eat both plants and animals






3. 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






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






5. Receive less rainfall than the temperate forests - have long - cold winters - and are inhabited by single coniferous tree-the spruce -extreme northern parts of Canada and Russia






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






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






8. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures






9. Recycle water - oxygen - and phosphorus






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






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






12. 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






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






14. Animals that consume green plants (herbivores)






15. Symbiotic relationship from which both organisms derive some benefit






16. Vegetation such as vines and eppiphytes






17. Links between oceans and land






18. Only animal life and other heterotrophic life exists






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






20. Freshwater Biomes vs. Saltwater 1: Freshwater is _______________ which results in the passage of water into the cell. Freshwater organisms have homeostatic mechanisms to maintain water balance by the regular removal of the excess water. these include






21. 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






22. Include reproduction and protection from predators and destructive weather






23. 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






24. 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






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






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






27. 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






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






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






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






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






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






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






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






35. Rock and soil surface






36. Conserve water actively






37. 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






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






39. 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






40. Deer - fox - woodchuck - and squirrel






41. Animals that consume primary consumers (carnivores)






42. 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






43. Regiong beneatht he photic zone that receives no light






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






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






46. The chief disruptive force






47. Organisms that manufacture their own food






48. 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






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






50. First to resettle a virgin area