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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. Conserve water actively






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






3. Determine by the amount of decaying plant and animal life in the soil






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






5. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat






6. Distinct community in a geographic region






7. Determines water holding capacity






8. 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






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






10. 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






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






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. Needs constant energy source and cycling of materials between the living system






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






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






16. Animals that consume dead animals






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






18. The oceans






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






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






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






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






23. Animals that consume only plants or plant foods






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






25. Two species may rapidly evolve in divergent directions under the strong selection pressure resulting from intense competition. thus - the two species would rapidly evolve greater differences in their niches






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






27. Animals that eat both plants and animals






28. Used to include only the population and not their physical environment






29. 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






30. Regiong beneatht he photic zone that receives no light






31. 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






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. 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






34. 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






35. Animals that consume primary consumers (carnivores)






36. Organisms that manufacture their own food






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






38. Include saprophytic organisms and organisms of decay






39. Have adaptations enabling them to survive in very cod water - with high pressures - and in complete darkness






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






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






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






43. Developed long legs and many are hoofed






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






45. Forest floors contain moss and lichens






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






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






48. 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






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






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