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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. Symbiotic relationship from which both organisms derive some benefit






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






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






4. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds






5. 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






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






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. Affect the type of vegetation that can be supported






9. The oceans






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






11. Polar bears - musk oxen - and arctic hens






12. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion






13. Include reproduction and protection from predators and destructive weather






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






15. 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






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






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






18. Vegetation such as vines and eppiphytes






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






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






21. Forest floors contain moss and lichens






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






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






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






25. 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






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






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






28. 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






29. Regiong beneatht he photic zone that receives no light






30. Animals that consume dead animals






31. 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






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






33. 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






34. The major component of the internal environment of all living things






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






36. Include saprophytic organisms and organisms of decay






37. 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






38. Only animal life and other heterotrophic life exists






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






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






41. First to resettle a virgin area






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






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






44. Distinct community in a geographic region






45. Recycle water - oxygen - and phosphorus






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






47. Integrated system of species that are dependent upon one another for survival






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






49. 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






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