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. Sunlit layer of the open sea extending to a depth of 250-600ft






2. Developed long legs and many are hoofed






3. Animals that consume only plants or plant foods






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






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






6. First to resettle a virgin area






7. Regiong beneatht he photic zone that receives no light






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






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






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






11. Include reproduction and protection from predators and destructive weather






12. Affect the type of vegetation that can be supported






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






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






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






16. The study of interactions between organisms and their environment






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






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






19. Organisms that manufacture their own food






20. 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






21. Animals that eat both plants and animals






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






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






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






25. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids






26. 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






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






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






29. The ultimate source of energy for all organisms






30. 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






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






32. Links between oceans and land






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






34. The chief disruptive force






35. 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






36. Lichens and moss






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






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






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






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






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






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






43. Animals that consume primary consumers (carnivores)






44. 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






45. Have adaptations enabling them to survive in very cod water - with high pressures - and in complete darkness






46. 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






47. The oceans






48. Include saprophytic organisms and organisms of decay






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






50. 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