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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. Developed long legs and many are hoofed






2. Symbiotic relationship from which both organisms derive some benefit






3. 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






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






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






6. Adaptations for maintaining their internal osmolarity and conserving water






7. 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






8. Animals that consume green plants (herbivores)






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






10. Lichens and moss






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






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






13. Affect the type of vegetation that can be supported






14. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles






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






16. Links between oceans and land






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






18. Animals that eat both plants and animals






19. Rock and soil surface






20. Include reproduction and protection from predators and destructive weather






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






22. The orderly process by which one biotic community replaces or succeeds another until a climax community is established






23. 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






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






25. Cold - dry - and inhabited by fir - pine - and spruce trees -much vegetation has evolved adaptations for water conservation such as needle-shaped leaves -Extreme Northern Part of the US and in Southern Canada






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






27. 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






28. Recycle water - oxygen - and phosphorus






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






30. Deer - fox - woodchuck - and squirrel






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






32. The chief disruptive force






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






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






35. Vegetation such as vines and eppiphytes






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






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






38. Organisms that manufacture their own food






39. 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






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






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






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






43. Distinct community in a geographic region






44. 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






45. 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






46. 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






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






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






49. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae






50. Each member of a food chain uses some of the energy it obtains from its food for its own metabolism and loses some additional energy in the form of heat