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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. 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






2. 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






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






4. Links between oceans and land






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






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






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






8. Only animal life and other heterotrophic life exists






9. Regiong beneatht he photic zone that receives no light






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. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying






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. 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






14. Include reproduction and protection from predators and destructive weather






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






16. Developed long legs and many are hoofed






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






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






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. Crawling and sessile organsms






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






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






23. 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






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






25. 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






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






27. 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






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






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






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






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






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






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






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






35. Animals that consume dead animals






36. Algae - crabs - crustacea - and many different species of fish






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






38. Animals that consume primary consumers (carnivores)






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






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






41. 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






42. Symbiotic relationship from which both organisms derive some benefit






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






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






45. Adaptations for maintaining their internal osmolarity and conserving water






46. The orderly process by which one biotic community replaces or succeeds another until a climax community is established






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






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






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