Test your basic knowledge |

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. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms






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






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






5. Organisms that manufacture their own food






6. Frozen area with no vegetation and terrestrial animals -animals that do inhabit polar regions generally live near the polar oceans






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






8. The study of interactions between organisms and their environment






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






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






11. 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






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






13. Elemental nitrogen is chemically inert and cannot be used by most organisms. Lightning and nitrogen-fixing bacteria in the roots of legumes change the nitrogen into the usable - soluble nitrates






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






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






16. 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






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






18. Determines water holding capacity






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






20. Developed long legs and many are hoofed






21. Regiong beneatht he photic zone that receives no light






22. 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






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






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






25. 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






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






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






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






29. Rock and soil surface






30. First to resettle a virgin area






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






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






33. Free-living organisms that feed on other living organisms






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






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






36. Vegetation such as vines and eppiphytes






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






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






39. 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






40. Animals that consume dead animals






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






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






43. Distinct community in a geographic region






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






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. Lichens and moss






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






48. 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






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






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