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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. 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






2. 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






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






4. 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






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






6. 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






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






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






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






10. 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






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






12. The ultimate source of energy for all organisms






13. Symbiotic relationship from which both organisms derive some benefit






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






15. The chief disruptive force






16. 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






17. Affect the type of vegetation that can be supported






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






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






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






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






22. Needs constant energy source and cycling of materials between the living system






23. Distinct community in a geographic region






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






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






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






27. Conserve water actively






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






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






30. 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






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






32. 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






33. First to resettle a virgin area






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






35. 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






36. 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






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






38. Adaptations for maintaining their internal osmolarity and conserving water






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






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






41. Deer - fox - woodchuck - and squirrel






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






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






44. Determines water holding capacity






45. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe






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






47. Crawling and sessile organsms






48. Links between oceans and land






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






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