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






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






3. 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






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






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






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






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






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






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






10. 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






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






12. Symbiotic relationship from which both organisms derive some benefit






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






14. The ultimate source of energy for all organisms






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






16. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying






17. 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






18. 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






19. Animals that consume green plants (herbivores)






20. Affect the type of vegetation that can be supported






21. Forest floors contain moss and lichens






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






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






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






25. 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






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






27. Developed long legs and many are hoofed






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






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






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






31. Animals that consume only plants or plant foods






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






33. Regiong beneatht he photic zone that receives no light






34. Vegetation has evolved adaptations for water conservation such as needle shaped leaves






35. Animals that eat both plants and animals






36. 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






37. The orderly process by which one biotic community replaces or succeeds another until a climax community is established






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






39. Used to include only the population and not their physical environment






40. Conserve water actively






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






42. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition






43. Deer - fox - woodchuck - and squirrel






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






45. Rock and soil surface






46. 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






47. Polar bears - musk oxen - and arctic hens






48. Organisms that manufacture their own food






49. 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






50. The oceans