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






2. 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






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






4. 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






5. Vegetation such as vines and eppiphytes






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






7. Include saprophytic organisms and organisms of decay






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






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






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






11. Rivers - lakes - ponds - and marshes






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






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






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






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






16. 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






17. The ultimate source of energy for all organisms






18. The study of interactions between organisms and their environment






19. Used to include only the population and not their physical environment






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






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






22. Animals that consume dead animals






23. Lichens and moss






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






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






26. Determines water holding capacity






27. First to resettle a virgin area






28. Because organisms at the upper levels of the food chain derive their food energy from organisms at lower levels - and because energy is lost from one level to the next - each level can support a successively smaller biomass






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






30. 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






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






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






33. Rock and soil surface






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






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






36. Only animal life and other heterotrophic life exists






37. 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






38. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place






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






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






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






43. Links between oceans and land






44. 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






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






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






47. 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






48. Adaptations for maintaining their internal osmolarity and conserving water






49. Distinct community in a geographic region






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