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






2. Include reproduction and protection from predators and destructive weather






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






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






5. 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






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






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






8. 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






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






10. Symbiotic relationship from which both organisms derive some benefit






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






12. Vegetation such as vines and eppiphytes






13. Conserve water actively






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






15. The chief disruptive force






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






17. Forest floors contain moss and lichens






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






19. The study of interactions between organisms and their environment






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






21. 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






22. Deer - fox - woodchuck - and squirrel






23. Only animal life and other heterotrophic life exists






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






25. 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






26. Crawling and sessile organsms






27. 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






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






29. Determines water holding capacity






30. 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






31. Animals that consume only plants or plant foods






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






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






34. Developed long legs and many are hoofed






35. Frozen area with no vegetation and terrestrial animals -animals that do inhabit polar regions generally live near the polar oceans






36. 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






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






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






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






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






41. 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






42. 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






43. 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






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






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






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






47. 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






48. The ultimate source of energy for all organisms






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






50. Lichens and moss