Test your basic knowledge |

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






2. Organisms that manufacture their own food






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






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






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






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






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






8. Animals that feed on secondary consumer






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






10. Links between oceans and land






11. 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






12. 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






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






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






15. 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






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






17. Conserve water actively






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






19. Distinct community in a geographic region






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






21. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor






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






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






24. The ultimate source of energy for all organisms






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






26. 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






27. Rivers - lakes - ponds - and marshes






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






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






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






31. 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






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






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






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






35. The chief disruptive force






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






37. Recycle water - oxygen - and phosphorus






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






39. Polar bears - musk oxen - and arctic hens






40. Without a constant input of energy from the sun - an ecosystem would soon run down - as food is transferred from one level of the food chain to the next - a transfer of energy occurs






41. Symbiotic relationship from which both organisms derive some benefit






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






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






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






45. 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






46. Adaptations for maintaining their internal osmolarity and conserving water






47. 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






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






49. Crawling and sessile organsms






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