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






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






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






4. 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






5. Evolve toward a balance in which the predator is a regulatory influence on th prey but not a threat to its survival






6. One species may be competitively superior to the other and drive the second to extinction






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






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






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






10. 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






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






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






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






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






15. Affect the type of vegetation that can be supported






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






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






18. Crawling and sessile organsms






19. Deer - fox - woodchuck - and squirrel






20. 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






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






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






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






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






25. The oceans






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






27. Include saprophytic organisms and organisms of decay






28. Links between oceans and land






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






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






31. Recycle water - oxygen - and phosphorus






32. Determined by the same decisive factors-temperatures and rainfall






33. Animals that feed on secondary consumer






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






35. Animals that consume only plants or plant foods






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






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






38. 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






39. 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






40. Polar bears - musk oxen - and arctic hens






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






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






43. Animals that consume primary consumers (carnivores)






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






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






46. 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






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






48. Conserve water actively






49. 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






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