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






2. 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






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






4. 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






5. Recycle water - oxygen - and phosphorus






6. 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






7. Rock and soil surface






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






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






10. 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






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






12. Polar bears - musk oxen - and arctic hens






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






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






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






17. Regiong beneatht he photic zone that receives no light






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






19. 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






20. 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






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






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






23. Deer - fox - woodchuck - and squirrel






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






25. 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






26. 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






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






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






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






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






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






32. Links between oceans and land






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






34. Include saprophytic organisms and organisms of decay






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






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






37. Freshwater Biomes vs. Saltwater 3: Freshwater biomes - except very large lakes - are affected by variations in _________. temperature of freshwater bodies varies considerably; they may freeze or dry up - and mud from their floors may be stirred up by






38. First to resettle a virgin area






39. Animals that eat both plants and animals






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






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






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






43. Developed long legs and many are hoofed






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






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






46. Rivers - lakes - ponds - and marshes






47. Animals that feed on secondary consumer






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






49. Determines water holding capacity






50. 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