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






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






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






4. Consists of populations of different plants and animal species interacting with each other in a given environment






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






6. Polar bears - musk oxen - and arctic hens






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






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






9. Recycle water - oxygen - and phosphorus






10. 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






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






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






13. Deer - fox - woodchuck - and squirrel






14. Animals that eat both plants and animals






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






16. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria






17. Vegetation such as vines and eppiphytes






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






19. The oceans






20. Organisms that manufacture their own food






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






22. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active






23. 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






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






25. Distinct community in a geographic region






26. Animals that consume primary consumers (carnivores)






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






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






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






30. Determines water holding capacity






31. Cold - dry - and inhabited by fir - pine - and spruce trees -much vegetation has evolved adaptations for water conservation such as needle-shaped leaves -Extreme Northern Part of the US and in Southern Canada






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






33. Treeless - frozen plain found between the taiga lands and the northern ice sheets - very short summer and thus a very short growing season during which time the ground becomes wet and marshy






34. Animals that consume only plants or plant foods






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






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






37. 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






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






39. 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






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






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






42. Individuals belonging to the same species use the same resources and if a particular resource is limited - then these organisms must compete with one another






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






44. Include saprophytic organisms and organisms of decay






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






46. First to resettle a virgin area






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






48. 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






49. 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






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







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