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






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






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






4. Region typical of the open seas and can be divided into photic and aphotic zones






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






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






7. 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






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






9. Links between oceans and land






10. 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






11. Regiong beneatht he photic zone that receives no light






12. Animals that consume only plants or plant foods






13. Only animal life and other heterotrophic life exists






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






15. 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






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






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






18. 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






19. One or both organisms can't survive without the other






20. Developed long legs and many are hoofed






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






22. 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






23. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere






24. 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






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






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






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






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






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






30. Rock and soil surface






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






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






33. 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






34. Organisms that manufacture their own food






35. Symbiotic relationship from which both organisms derive some benefit






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






37. Animals that eat both plants and animals






38. Forest floors contain moss and lichens






39. The study of interactions between organisms and their environment






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






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






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






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






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






45. 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






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






47. 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






48. Every energy transfer involves a loss of energy and each level of the food chain uses some of the energy it obtains from the food for its own metabolism and loses some additional energy in the form of heat






49. First to resettle a virgin area






50. 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