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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. Each member of a food chain uses some of the energy it obtains from its food for its own metabolism and loses some additional energy in the form of heat






2. The study of interactions between organisms and their environment






3. Forest floors contain moss and lichens






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






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






6. Crawling and sessile organsms






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






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






9. The oceans






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






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






12. Animals that feed on secondary consumer






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






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






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






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






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






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






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






20. 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






21. Determines the nature of plant and animal life in the soil






22. Regiong beneatht he photic zone that receives no light






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






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






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






26. 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






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






28. Food chain is not a simple linear chain but an intricate web






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






30. Distinct community in a geographic region






31. The metabolically produced CO2 is released to the air. The rest of the orgnaic carbon remains locked whthin an organism until its death (except for wastes given off) - at which time decay processes by bacteria return the CO2 to the air






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






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






34. Vegetation such as vines and eppiphytes






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






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






37. Individuals belonging to the same species use the same resources and if a particular resource is limited - then these organisms must compete with one another






38. Adaptations for maintaining their internal osmolarity and conserving water






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






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






41. Symbiotic relationship from which both organisms derive some benefit






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






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






44. 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






45. 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






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






47. The nitrogen locked up in the wastes and dead tissues is released by the action of the bacteria of decay - which convert the proteins into ammonia






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






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






50. Polar bears - musk oxen - and arctic hens