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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. 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






2. 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






3. Links between oceans and land






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






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






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






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






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






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






10. 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






11. 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






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






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






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






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






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






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






18. Affect the type of vegetation that can be supported






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






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






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






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






23. 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






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






25. 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






26. Animals that consume only plants or plant foods






27. Adaptations for maintaining their internal osmolarity and conserving water






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






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






30. Animals that eat both plants and animals






31. 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






32. Vegetation such as vines and eppiphytes






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






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






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






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






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






39. 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






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






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






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






43. 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






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






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. Only animal life and other heterotrophic life exists






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






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






49. Distinct community in a geographic region






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