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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. Treeless - frozen plain found between the taiga lands and the northern ice sheets - very short summer and thus a very short growing season during which time the ground becomes wet and marshy






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






3. Every energy transfer involves a loss of energy and each level of the food chain uses some of the energy it obtains from the food for its own metabolism and loses some additional energy in the form of heat






4. Animals that consume dead animals






5. First to resettle a virgin area






6. Affect the type of vegetation that can be supported






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






8. The ultimate source of energy for all organisms






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






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






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






12. 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






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






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






15. Rivers - lakes - ponds - and marshes






16. Deer - fox - woodchuck - and squirrel






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






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






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






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






21. 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






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






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






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






25. Polar bears - musk oxen - and arctic hens






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






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






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






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






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






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






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






33. Animals that consume only plants or plant foods






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






35. Distinct community in a geographic region






36. 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






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






38. Include reproduction and protection from predators and destructive weather






39. 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






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






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






42. 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






43. Include saprophytic organisms and organisms of decay






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. 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






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






47. The oceans






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






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






50. 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