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






2. 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






3. Distinct community in a geographic region






4. Symbiotic relationship from which both organisms derive some benefit






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






6. 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






7. Animals that consume green plants (herbivores)






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






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






10. Polar bears - musk oxen - and arctic hens






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






12. First to resettle a virgin area






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






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






15. 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






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






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






18. Vegetation such as vines and eppiphytes






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






20. Rivers - lakes - ponds - and marshes






21. 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






22. The ultimate source of energy for all organisms






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






24. Crawling and sessile organsms






25. Links between oceans and land






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






27. Forest floors contain moss and lichens






28. Regiong beneatht he photic zone that receives no light






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






30. 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






31. Organisms that manufacture their own food






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






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






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






35. The chief disruptive force






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






37. Only animal life and other heterotrophic life exists






38. Animals that eat both plants and animals






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






40. Developed long legs and many are hoofed






41. 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






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






43. 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






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






45. 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






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






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






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. The oceans






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