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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. 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






2. 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






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






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. 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






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






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






8. 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






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






10. 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






11. First to resettle a virgin area






12. The chief disruptive force






13. The oceans






14. When a parasite benefits at the expense of the host






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






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






17. Animals that consume only plants or plant foods






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






19. Crawling and sessile organsms






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






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






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






23. Rhododendrons and pines are more suited for growth in acid oil






24. Animals that eat both plants and animals






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






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






27. 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






28. The study of interactions between organisms and their environment






29. Animals that consume dead animals






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






31. Regiong beneatht he photic zone that receives no light






32. Determines water holding capacity






33. 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






34. Lichens and moss






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






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






37. Include saprophytic organisms and organisms of decay






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






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






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






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






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






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






44. 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






45. 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






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






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






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






49. Recycle water - oxygen - and phosphorus






50. 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






Can you answer 50 questions in 15 minutes?



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