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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. Vegetation such as vines and eppiphytes






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






3. Symbiotic relationship from which both organisms derive some benefit






4. Sunlit layer of the open sea extending to a depth of 250-600ft






5. First to resettle a virgin area






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






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






8. 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






9. 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






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






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






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






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






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






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






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






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






18. The oceans






19. Rivers - lakes - ponds - and marshes






20. 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






21. Affect the type of vegetation that can be supported






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






23. 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






24. 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






25. Determines water holding capacity






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






27. Recycle water - oxygen - and phosphorus






28. Animals that consume only plants or plant foods






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






30. Region exposed to low tides that undergoes variations in temperature and periods of dryness






31. Include saprophytic organisms and organisms of decay






32. Deer - fox - woodchuck - and squirrel






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






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






35. 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






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






37. Animals that consume dead animals






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






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






40. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles






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






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






43. Forest floors contain moss and lichens






44. Treeless - frozen plain found between the taiga lands and the northern ice sheets - very short summer and thus a very short growing season during which time the ground becomes wet and marshy






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






46. 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






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






48. Animals eat plants and use the digested nutrients to form carbohydrates - fats - and proteins characteristic of the species. a part of these organic compounds is used as fuel in respiration in plants and animals






49. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die






50. 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







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