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






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






3. Organisms that manufacture their own food






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






5. 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






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






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






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






9. Crawling and sessile organsms






10. 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






11. 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






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






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






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






15. Symbiotic relationship from which both organisms derive some benefit






16. 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






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






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






19. Include reproduction and protection from predators and destructive weather






20. Vegetation such as vines and eppiphytes






21. Links between oceans and land






22. Forest floors contain moss and lichens






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






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






25. 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






26. The study of interactions between organisms and their environment






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






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






29. 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






30. Characterized by low rainfall - although considerably more than the desert biomes receive -provide no shelter for herbivorous mammals from carnivorous predators -ex: East of the Rockies - steppes of the Ukraine - and the pampas of Argentina






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






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






33. Includes climate - temperature - availability of light and water - and the local topology






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






35. Recycle water - oxygen - and phosphorus






36. Include saprophytic organisms and organisms of decay






37. 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






38. The chief disruptive force






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






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






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






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






43. Animals that feed on secondary consumer






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






45. 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






46. 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






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






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






49. 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






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