Test your basic knowledge |

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. 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






2. Animals that feed on secondary consumer






3. Polar bears - musk oxen - and arctic hens






4. First to resettle a virgin area






5. The vegetation that becomes dominant and stable after years of evolutiionary development






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






7. Conserve water actively






8. Developed long legs and many are hoofed






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






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






11. 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






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






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






14. Animals that consume primary consumers (carnivores)






15. Affect the type of vegetation that can be supported






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






17. Animals that consume only plants or plant foods






18. The metabolically produced CO2 is released to the air. The rest of the orgnaic carbon remains locked whthin an organism until its death (except for wastes given off) - at which time decay processes by bacteria return the CO2 to the air






19. Recycle water - oxygen - and phosphorus






20. 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






21. The oceans






22. 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






23. Include reproduction and protection from predators and destructive weather






24. 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






25. Food chain is not a simple linear chain but an intricate web






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






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






28. 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






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






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






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






32. 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






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






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






35. 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






36. 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






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






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






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






40. The chief disruptive force






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






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






43. Lichens and moss






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






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






46. Free-living organisms that feed on other living organisms






47. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion






48. Characterized by low rainfall - although considerably more than the desert biomes receive -provide no shelter for herbivorous mammals from carnivorous predators -ex: East of the Rockies - steppes of the Ukraine - and the pampas of Argentina






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






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