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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. Trees such as beech - maple - oaks - and willows shed their leaves during cold winters months






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






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






4. Each member of a food chain uses some of the energy it obtains from its food for its own metabolism and loses some additional energy in the form of heat






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






6. 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






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






8. 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






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






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






11. Rivers - lakes - ponds - and marshes






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






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






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






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






16. One species may be competitively superior to the other and drive the second to extinction






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






18. Determines water holding capacity






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






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






21. Include reproduction and protection from predators and destructive weather






22. 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






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






24. Adaptations for maintaining their internal osmolarity and conserving water






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






26. The chief disruptive force






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






28. Crawling and sessile organsms






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






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






31. Only animal life and other heterotrophic life exists






32. 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






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






34. 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






35. 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






36. Vegetation such as vines and eppiphytes






37. Rock and soil surface






38. Animals that consume dead animals






39. 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






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






41. Lichens and moss






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






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






44. Determined by the same decisive factors-temperatures and rainfall






45. 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






46. Conserve water actively






47. First to resettle a virgin area






48. Include saprophytic organisms and organisms of decay






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






50. 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