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






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






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






4. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms






5. Animals that consume only plants or plant foods






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






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






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






9. Affect the type of vegetation that can be supported






10. 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






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






12. The ultimate source of energy for all organisms






13. 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






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






15. 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






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






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






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






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






20. Animals that only eat other animals -possess pointed teeth and fang-like canine teeth for tearing flesh -have shorter digestive tracts because the easier digestibility of animal food






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






22. 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






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






24. Animals that consume green plants (herbivores)






25. Animals that consume primary consumers (carnivores)






26. Distinct community in a geographic region






27. Only animal life and other heterotrophic life exists






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






29. First to resettle a virgin area






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






31. 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






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






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






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






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






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






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






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






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






40. 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






41. 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






42. Conserve water actively






43. 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






44. 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






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






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






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






48. Symbiotic relationship from which both organisms derive some benefit






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






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