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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. First to resettle a virgin area






2. 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






3. Crawling and sessile organsms






4. 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






5. Animals that consume dead animals






6. 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






7. Distinct community in a geographic region






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






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






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






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






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






13. When one organism is benefited by the association and the other is not affected






14. Animals that eat both plants and animals






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






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






17. 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






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






19. Polar bears - musk oxen - and arctic hens






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






21. Forest floors contain moss and lichens






22. Jungles characterized by high temperatures and torrential rains -found in Central Africa - Central America - the Amazon basic - and Southeast Asia






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






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






25. Animals that consume only plants or plant foods






26. 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






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






28. Organisms that manufacture their own food






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






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






31. 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






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






33. Affect the type of vegetation that can be supported






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






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






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






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






38. Links between oceans and land






39. Determines water holding capacity






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






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






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






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






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






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






46. The ultimate source of energy for all organisms






47. Lichens and moss






48. Adaptations for maintaining their internal osmolarity and conserving water






49. 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






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







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