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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. 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






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






3. Animals that consume dead animals






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






5. Regiong beneatht he photic zone that receives no light






6. 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






7. Only animal life and other heterotrophic life exists






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






9. Links between oceans and land






10. The study of interactions between organisms and their environment






11. Crawling and sessile organsms






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






13. The oceans






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






15. 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






16. Trees such as beech - maple - oaks - and willows shed their leaves during cold winters months






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






18. 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






19. Recycle water - oxygen - and phosphorus






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






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






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






23. Polar bears - musk oxen - and arctic hens






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






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






26. 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






27. Evolve toward a balance in which the predator is a regulatory influence on th prey but not a threat to its survival






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






29. Determines water holding capacity






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






31. Developed long legs and many are hoofed






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






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






34. Organisms that manufacture their own food






35. 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






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






37. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles






38. Animals that eat both plants and animals






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






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






41. Vegetation such as vines and eppiphytes






42. 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






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






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






46. The metabolically produced CO2 is released to the air. The rest of the orgnaic carbon remains locked whthin an organism until its death (except for wastes given off) - at which time decay processes by bacteria return the CO2 to the air






47. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels






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






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






50. Individuals belonging to the same species use the same resources and if a particular resource is limited - then these organisms must compete with one another