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






2. Conserve water actively






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






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






5. 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






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






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






8. 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






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






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






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






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






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






14. Regiong beneatht he photic zone that receives no light






15. Animals that eat both plants and animals






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






17. 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






18. 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






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






20. 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






21. Animals that feed on secondary consumer






22. Recycle water - oxygen - and phosphorus






23. The ultimate source of energy for all organisms






24. 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






25. Determines the nature of plant and animal life in the soil






26. Links between oceans and land






27. Freshwater Biomes vs. Saltwater 3: Freshwater biomes - except very large lakes - are affected by variations in _________. temperature of freshwater bodies varies considerably; they may freeze or dry up - and mud from their floors may be stirred up by






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






29. Freshwater Biomes vs. Saltwater 1: Freshwater is _______________ which results in the passage of water into the cell. Freshwater organisms have homeostatic mechanisms to maintain water balance by the regular removal of the excess water. these include






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






31. Animals that consume dead animals






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






33. 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






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






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






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






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






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






39. Include saprophytic organisms and organisms of decay






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






41. Deer - fox - woodchuck - and squirrel






42. 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






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






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






45. Sunlit layer of the open sea extending to a depth of 250-600ft






46. 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






47. The chief disruptive force






48. 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






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






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