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






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






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






4. 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






5. Determines water holding capacity






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






7. Organisms that manufacture their own food






8. Animals that consume primary consumers (carnivores)






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






10. Include saprophytic organisms and organisms of decay






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






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






13. Region typical of the open seas and can be divided into photic and aphotic zones






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






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. Crawling and sessile organsms






17. 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






18. Links between oceans and land






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






20. The oceans






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






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






23. 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






24. First to resettle a virgin area






25. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae






26. Lichens and moss






27. Integrated system of species that are dependent upon one another for survival






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






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






30. Rock and soil surface






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






32. 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






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






34. 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






35. 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






36. Animals that feed on secondary consumer






37. 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






38. Regiong beneatht he photic zone that receives no light






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






40. Only animal life and other heterotrophic life exists






41. Animals that consume dead animals






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






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






44. Rivers - lakes - ponds - and marshes






45. Vegetation such as vines and eppiphytes






46. Polar bears - musk oxen - and arctic hens






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






48. Deer - fox - woodchuck - and squirrel






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






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