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






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






3. Lichens and moss






4. 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






5. 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






6. First to resettle a virgin area






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






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






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






10. Animals that consume dead animals






11. Recycle water - oxygen - and phosphorus






12. Organisms that manufacture their own food






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






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






15. Rivers - lakes - ponds - and marshes






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






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






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






19. 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






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






21. Developed long legs and many are hoofed






22. Include reproduction and protection from predators and destructive weather






23. Animals that consume green plants (herbivores)






24. Vegetation such as vines and eppiphytes






25. 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






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






27. 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






28. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms






29. The oceans






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






31. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms






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






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






34. Determines water holding capacity






35. The study of interactions between organisms and their environment






36. Regiong beneatht he photic zone that receives no light






37. Crawling and sessile organsms






38. 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






39. Distinct community in a geographic region






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






41. Polar bears - musk oxen - and arctic hens






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






43. 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






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






45. 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






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






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






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






50. 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