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






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






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






4. The study of interactions between organisms and their environment






5. Animals that consume green plants (herbivores)






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






7. Include saprophytic organisms and organisms of decay






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






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






10. Vegetation such as vines and eppiphytes






11. Deer - fox - woodchuck - and squirrel






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






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






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






15. Animals that feed on secondary consumer






16. Rock and soil surface






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






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






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






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






21. 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






22. 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






23. Crawling and sessile organsms






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






25. Region on the continental shelf that contains ocean area with depths up to 600 feet and extends several hundred miles from the shores






26. Lichens and moss






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






28. Conserve water actively






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






30. 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






31. 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






32. 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






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






34. Rivers - lakes - ponds - and marshes






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






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






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






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






39. Developed long legs and many are hoofed






40. 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






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






42. First to resettle a virgin area






43. 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






44. Animals that consume dead animals






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






46. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down






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






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






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






50. Include reproduction and protection from predators and destructive weather