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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. Rivers - lakes - ponds - and marshes






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






3. Rock and soil surface






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






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






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






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






8. Vegetation such as vines and eppiphytes






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






10. 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






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






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






13. Distinct community in a geographic region






14. Affect the type of vegetation that can be supported






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






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






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






18. Animals that eat both plants and animals






19. 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






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






21. Determines water holding capacity






22. Sunlit layer of the open sea extending to a depth of 250-600ft






23. Symbiotic relationship from which both organisms derive some benefit






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






25. Include reproduction and protection from predators and destructive weather






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






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






28. 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






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






30. 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






31. Animals that consume only plants or plant foods






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






33. 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






34. Regiong beneatht he photic zone that receives no light






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






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






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. The study of interactions between organisms and their environment






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






40. Defines the functional role of an organism in its ecosystem -described what the organism eats - where and how it obtains its food - what climatic factors it can tolerate and which are optimal - the nature of its parasites and predators - where and ho






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






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






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






44. 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






45. Crawling and sessile organsms






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






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






48. The ultimate source of energy for all organisms






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






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