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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. Animals that feed on secondary consumer






2. 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






3. Rock and soil surface






4. The chief disruptive force






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






6. Include reproduction and protection from predators and destructive weather






7. Affect the type of vegetation that can be supported






8. Conserve water actively






9. Adaptations for maintaining their internal osmolarity and conserving water






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






11. Animals that consume only plants or plant foods






12. 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






13. Developed long legs and many are hoofed






14. 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






15. Symbiotic relationship from which both organisms derive some benefit






16. 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






17. 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






18. Recycle water - oxygen - and phosphorus






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






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






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






22. Regiong beneatht he photic zone that receives no light






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






24. Lichens and moss






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






26. Composed of populations that are able to exist under the new conditions






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






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






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






30. Vegetation such as vines and eppiphytes






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






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






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






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






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






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






37. Links between oceans and land






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






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






40. 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






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






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






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






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






45. Freshwater Biomes vs. Saltwater 1: Freshwater is _______________ which results in the passage of water into the cell. Freshwater organisms have homeostatic mechanisms to maintain water balance by the regular removal of the excess water. these include






46. Rivers - lakes - ponds - and marshes






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






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






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






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







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