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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. Forest floors contain moss and lichens






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






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






4. Distinct community in a geographic region






5. Include reproduction and protection from predators and destructive weather






6. Include saprophytic organisms and organisms of decay






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






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






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






10. Animals that consume only plants or plant foods






11. Animals that consume primary consumers (carnivores)






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






13. 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






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






15. Regiong beneatht he photic zone that receives no light






16. The oceans






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






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






19. 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






20. The ultimate source of energy for all organisms






21. 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






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






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






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






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






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. Developed long legs and many are hoofed






28. Lichens and moss






29. Crawling and sessile organsms






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






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






32. Polar bears - musk oxen - and arctic hens






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






34. The chief disruptive force






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






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






37. Animals that consume dead animals






38. Vegetation such as vines and eppiphytes






39. The study of interactions between organisms and their environment






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






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






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






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






44. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe






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






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






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






48. 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






49. Adaptations for maintaining their internal osmolarity and conserving water






50. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment