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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. 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






2. The study of interactions between organisms and their environment






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






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






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






6. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels






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






8. The chief disruptive force






9. Symbiotic relationship from which both organisms derive some benefit






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






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






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






13. 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






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






15. 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






16. Determines water holding capacity






17. 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






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






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






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






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






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






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






24. Each member of a food chain uses some of the energy it obtains from its food for its own metabolism and loses some additional energy in the form of heat






25. Freshwater Biomes vs. Saltwater 2: In rivers and streams - strong swift currents exist - and thus fish that have developed strong muscles and plants with _____________ have survived






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






27. The ultimate source of energy for all organisms






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






29. Animals eat plants and use the digested nutrients to form carbohydrates - fats - and proteins characteristic of the species. a part of these organic compounds is used as fuel in respiration in plants and animals






30. Include reproduction and protection from predators and destructive weather






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






32. Animals that consume primary consumers (carnivores)






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






34. Community in an ecological succession is identified by a dominant species






35. 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






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






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






38. 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






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






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






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






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






43. 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






44. Every energy transfer involves a loss of energy and each level of the food chain uses some of the energy it obtains from the food for its own metabolism and loses some additional energy in the form of heat






45. 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






46. Polar bears - musk oxen - and arctic hens






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






48. Vegetation such as vines and eppiphytes






49. Animals that consume dead animals






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