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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. 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






2. 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






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






4. Any group of similar organisms that are capable of reproducing






5. Forest floors contain moss and lichens






6. 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






7. Affect the type of vegetation that can be supported






8. Animals that eat both plants and animals






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






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






11. Encompasses all that is external to the organism and is necessary for its existence






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






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






14. 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






15. Animals that consume green plants (herbivores)






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






17. Deer - fox - woodchuck - and squirrel






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






19. Symbiotic relationship from which both organisms derive some benefit






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






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






22. Crawling and sessile organsms






23. Free-living organisms that feed on other living organisms






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






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






26. The ultimate source of energy for all organisms






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






28. 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






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






30. 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






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






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






33. Conserve water actively






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






35. Recycle water - oxygen - and phosphorus






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






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






38. Distinct community in a geographic region






39. Animals that consume only plants or plant foods






40. 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






41. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae






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






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






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






45. 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






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






47. Composed of populations that are able to exist under the new conditions






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






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






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