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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. The ultimate source of energy for all organisms






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






3. 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






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






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






6. Nekton and benthos - scavengers - and predators (fiercely competitive)






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






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






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






10. 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






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






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






13. Animals that consume dead animals






14. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition






15. Every energy transfer involves a loss of energy and each level of the food chain uses some of the energy it obtains from the food for its own metabolism and loses some additional energy in the form of heat






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






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






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






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






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






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






22. Developed long legs and many are hoofed






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






24. 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






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






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






27. Two species may rapidly evolve in divergent directions under the strong selection pressure resulting from intense competition. thus - the two species would rapidly evolve greater differences in their niches






28. Affect the type of vegetation that can be supported






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






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






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






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






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






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






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






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






38. Polar bears - musk oxen - and arctic hens






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






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






41. Animals that consume only plants or plant foods






42. 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






43. Recycle water - oxygen - and phosphorus






44. Determines water holding capacity






45. Symbiotic relationship from which both organisms derive some benefit






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






47. Crawling and sessile organsms






48. The study of interactions between organisms and their environment






49. 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






50. Only animal life and other heterotrophic life exists