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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. Conserve water actively






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






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






4. Include reproduction and protection from predators and destructive weather






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






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






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






8. 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






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






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






11. First to resettle a virgin area






12. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem






13. 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






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






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






16. 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






17. Forest floors contain moss and lichens






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






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






20. Animals that eat both plants and animals






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






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






23. 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






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






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






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






27. 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






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






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






30. Animals that consume primary consumers (carnivores)






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






32. 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






33. Animals that consume dead animals






34. Distinct community in a geographic region






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






36. 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






37. Include saprophytic organisms and organisms of decay






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






39. Polar bears - musk oxen - and arctic hens






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






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






42. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds






43. One or both organisms can't survive without the other






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






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






46. 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






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






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






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






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