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






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






3. Freshwater Biomes vs. Saltwater 1: Freshwater is _______________ which results in the passage of water into the cell. Freshwater organisms have homeostatic mechanisms to maintain water balance by the regular removal of the excess water. these include






4. 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






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






6. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes






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






8. Animals that consume dead animals






9. Lichens and moss






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






11. Animals that consume only plants or plant foods






12. Polar bears - musk oxen - and arctic hens






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






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






15. 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






16. Distinct community in a geographic region






17. 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






18. 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






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






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






21. 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






22. 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






23. Affect the type of vegetation that can be supported






24. The oceans






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






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






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






28. 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






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






30. Recycle water - oxygen - and phosphorus






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






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






33. 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






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






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






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






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






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






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






40. 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






41. Regiong beneatht he photic zone that receives no light






42. 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






43. Determines water holding capacity






44. The chief disruptive force






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






46. Conserve water actively






47. Deer - fox - woodchuck - and squirrel






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






49. Developed long legs and many are hoofed






50. The ultimate source of energy for all organisms







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