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






2. Conserve water actively






3. One species may be competitively superior in some regions - and the other may be superior in other regions under different environmental conditions. this would result in the elimination of one species in some places and the other in other places






4. Animals that eat both plants and animals






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






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






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






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






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






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






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






12. The study of interactions between organisms and their environment






13. Links between oceans and land






14. More than 70% of earth -plants have little controlling influence in communities -most stable ecosystems; the conditions affecting temperature - amount of available oxygen and cabon dioxide - and amount of suspended or dissolve materials are very stab






15. Region typical of the open seas and can be divided into photic and aphotic zones






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






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






18. Deer - fox - woodchuck - and squirrel






19. 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






20. 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






21. Rock and soil surface






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






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






24. Only animal life and other heterotrophic life exists






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






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






27. 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






28. The oceans






29. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere






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






31. Rivers - lakes - ponds - and marshes






32. Rhododendrons and pines are more suited for growth in acid oil






33. Because organisms at the upper levels of the food chain derive their food energy from organisms at lower levels - and because energy is lost from one level to the next - each level can support a successively smaller biomass






34. 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






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






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. 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






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






39. 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






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






41. Include reproduction and protection from predators and destructive weather






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






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






44. The chief disruptive force






45. Determines water holding capacity






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






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






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






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






50. Symbiotic relationship from which both organisms derive some benefit