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






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






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






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






5. 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






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






7. Include reproduction and protection from predators and destructive weather






8. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants






9. 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






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






11. Conserve water actively






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






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






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






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






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. Animals that eat both plants and animals






18. 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






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






20. Links between oceans and land






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






22. Animals that consume only plants or plant foods






23. Distinct community in a geographic region






24. 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






25. Developed long legs and many are hoofed






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






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






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






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






30. 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






31. 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






32. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food






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






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






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






36. 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






37. Crawling and sessile organsms






38. Animals that consume green plants (herbivores)






39. 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






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






41. Symbiotic relationship from which both organisms derive some benefit






42. 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






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






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






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






46. 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






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






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






49. Animals that consume primary consumers (carnivores)






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







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