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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. Deer - fox - woodchuck - and squirrel






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






3. Treeless - frozen plain found between the taiga lands and the northern ice sheets - very short summer and thus a very short growing season during which time the ground becomes wet and marshy






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






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






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






7. 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






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






9. Organisms that manufacture their own food






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






11. 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






12. 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






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






14. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids






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






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






17. 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






18. Animals that consume only plants or plant foods






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






20. 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






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






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






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






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






25. Symbiotic relationship from which both organisms derive some benefit






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






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






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






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






30. Animals that eat both plants and animals






31. Developed long legs and many are hoofed






32. The oceans






33. 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






34. Include reproduction and protection from predators and destructive weather






35. Links between oceans and land






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






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






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






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






40. 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






41. Includes climate - temperature - availability of light and water - and the local topology






42. Rhododendrons and pines are more suited for growth in acid oil






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






44. 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






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






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






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






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






49. 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






50. Animals that consume dead animals