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. 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






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






3. Forest floors contain moss and lichens






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






5. 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






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






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






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






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






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






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






12. Recycle water - oxygen - and phosphorus






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






14. Animals that eat both plants and animals






15. 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






16. Animals that consume green plants (herbivores)






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






18. 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






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






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






21. Gaseous CO2 enters the living world when plants use it to produce glucose via photosynthesis. The carbon atoms in CO2 are bonded to hydrogen and other carbon atoms. the plant uses the glucose to make starch - proteins - and fat






22. 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






23. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food






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. Distinct community in a geographic region






26. 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






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






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






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






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






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






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






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






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






35. 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






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






37. The chief disruptive force






38. Include reproduction and protection from predators and destructive weather






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






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






41. Organisms that manufacture their own food






42. Developed long legs and many are hoofed






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






44. 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






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






46. Affect the type of vegetation that can be supported






47. The oceans






48. Only animal life and other heterotrophic life exists






49. 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






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