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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. 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






2. Forest floors contain moss and lichens






3. Freshwater Biomes vs. Saltwater 2: In rivers and streams - strong swift currents exist - and thus fish that have developed strong muscles and plants with _____________ have survived






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






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






6. Crawling and sessile organsms






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






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






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






10. Animals that consume dead animals






11. Consists of populations of different plants and animal species interacting with each other in a given environment






12. 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






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






14. Vegetation such as vines and eppiphytes






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






16. Include saprophytic organisms and organisms of decay






17. Determines water holding capacity






18. 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






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






20. 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






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






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






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






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






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






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






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






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






29. Polar bears - musk oxen - and arctic hens






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






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






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






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






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






35. Distinct community in a geographic region






36. 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






37. Links between oceans and land






38. Include reproduction and protection from predators and destructive weather






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






40. Regiong beneatht he photic zone that receives no light






41. 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






42. Animals that feed on secondary consumer






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






44. Adaptations for maintaining their internal osmolarity and conserving water






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






46. 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






47. Conserve water actively






48. The oceans






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






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