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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. 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






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






3. 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






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






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






6. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants






7. Include reproduction and protection from predators and destructive weather






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






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






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






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






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






13. The oceans






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






15. Animals that feed on secondary consumer






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






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






18. Only animal life and other heterotrophic life exists






19. Adaptations for maintaining their internal osmolarity and conserving water






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






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






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






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






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






25. 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






26. 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






27. Algae - crabs - crustacea - and many different species of fish






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






29. 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






30. Crawling and sessile organsms






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






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






33. Determines water holding capacity






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






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






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






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






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






39. Distinct community in a geographic region






40. First to resettle a virgin area






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






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






43. The chief disruptive force






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






45. Receive less than ten inches of rain each year; the rain is concentrated within a few heavy cloudbursts -ex: Sahara in Africa and Gobi in Asia






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






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






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






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






50. 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