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






2. Animals that consume primary consumers (carnivores)






3. Include saprophytic organisms and organisms of decay






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






5. Characterized by low rainfall - although considerably more than the desert biomes receive -provide no shelter for herbivorous mammals from carnivorous predators -ex: East of the Rockies - steppes of the Ukraine - and the pampas of Argentina






6. Rivers - lakes - ponds - and marshes






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






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






9. 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






10. 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






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






12. 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






13. Symbiotic relationship from which both organisms derive some benefit






14. 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






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






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






17. Deer - fox - woodchuck - and squirrel






18. 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






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






20. Animals that consume only plants or plant foods






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






22. Include reproduction and protection from predators and destructive weather






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






24. Conserve water actively






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






26. 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






27. Animals that feed on secondary consumer






28. Distinct community in a geographic region






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






30. 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






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






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






33. Recycle water - oxygen - and phosphorus






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






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






36. Freshwater Biomes vs. Saltwater 3: Freshwater biomes - except very large lakes - are affected by variations in _________. temperature of freshwater bodies varies considerably; they may freeze or dry up - and mud from their floors may be stirred up by






37. 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






38. Affect the type of vegetation that can be supported






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






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






41. Links between oceans and land






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






43. Two fates await the ammonia (NH3). some are nitrified or dentrified






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






45. Rock and soil surface






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






47. The ultimate source of energy for all organisms






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






49. 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






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