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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. 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






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






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






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






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






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






7. 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






8. 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






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






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






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






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






13. Determines water holding capacity






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






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






16. 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






17. Conserve water actively






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






19. Animals that eat both plants and animals






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






21. 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






22. 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






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






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






25. Symbiotic relationship from which both organisms derive some benefit






26. 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






27. Rivers - lakes - ponds - and marshes






28. Forest floors contain moss and lichens






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






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






31. Animals that feed on secondary consumer






32. Animals that consume primary consumers (carnivores)






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






34. 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






35. Organisms that manufacture their own food






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






37. 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






38. The oceans






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






40. Animals that only eat other animals -possess pointed teeth and fang-like canine teeth for tearing flesh -have shorter digestive tracts because the easier digestibility of animal food






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






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






43. Animals that consume green plants (herbivores)






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






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






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






47. 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






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






49. 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






50. Recycle water - oxygen - and phosphorus