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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. Any group of similar organisms that are capable of reproducing






2. Recycle water - oxygen - and phosphorus






3. Only animal life and other heterotrophic life exists






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






5. 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






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






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






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






9. Animals that feed on secondary consumer






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






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






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






13. Includes the community and the environment and usually all five kingdoms






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






15. Conserve water actively






16. Animals that only eat other animals -possess pointed teeth and fang-like canine teeth for tearing flesh -have shorter digestive tracts because the easier digestibility of animal food






17. Affect the type of vegetation that can be supported






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






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






20. 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






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






22. 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






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






24. Developed long legs and many are hoofed






25. 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






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






27. Community in an ecological succession is identified by a dominant species






28. First to resettle a virgin area






29. Deer - fox - woodchuck - and squirrel






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






31. Forest floors contain moss and lichens






32. The study of interactions between organisms and their environment






33. Symbiotic relationship from which both organisms derive some benefit






34. Organisms that manufacture their own food






35. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins






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






37. Rock and soil surface






38. The oceans






39. 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






40. Links between oceans and land






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






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






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






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






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






46. 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






47. Rivers - lakes - ponds - and marshes






48. 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






49. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place






50. 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







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