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






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






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






4. Vegetation such as vines and eppiphytes






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






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






7. Affect the type of vegetation that can be supported






8. Polar bears - musk oxen - and arctic hens






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






10. 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






11. 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






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






13. Adaptations for maintaining their internal osmolarity and conserving water






14. 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






15. Only animal life and other heterotrophic life exists






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






17. Rock and soil surface






18. 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






19. Include saprophytic organisms and organisms of decay






20. The study of interactions between organisms and their environment






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






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. Conserve water actively






24. 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






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






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






27. Animals that eat both plants and animals






28. 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






29. Animals that consume primary consumers (carnivores)






30. 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






31. 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






32. 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






33. Include reproduction and protection from predators and destructive weather






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






35. 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






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






37. 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






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






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






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






41. Vegetation has evolved adaptations for water conservation such as needle shaped leaves






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






43. Developed long legs and many are hoofed






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






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






46. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles






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






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






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






50. Links between oceans and land