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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. Any group of similar organisms that are capable of reproducing






2. Organisms that manufacture their own food






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






4. 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






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






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






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






8. 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






9. Animals that consume primary consumers (carnivores)






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






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






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






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






14. Distinct community in a geographic region






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






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






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






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






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






20. Animals that consume only plants or plant foods






21. The study of interactions between organisms and their environment






22. Include reproduction and protection from predators and destructive weather






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






24. Vegetation has evolved adaptations for water conservation such as needle shaped leaves






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






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






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






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






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






30. 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






31. 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






32. Animals that consume dead animals






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






34. Determines water holding capacity






35. The ultimate source of energy for all organisms






36. Deer - fox - woodchuck - and squirrel






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






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






40. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures






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






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






43. 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






44. Polar bears - musk oxen - and arctic hens






45. Lichens and moss






46. Vegetation such as vines and eppiphytes






47. First to resettle a virgin area






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






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






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







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