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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. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor






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






3. Distinct community in a geographic region






4. Developed long legs and many are hoofed






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






6. Include reproduction and protection from predators and destructive weather






7. Animals that consume only plants or plant foods






8. 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






9. Include saprophytic organisms and organisms of decay






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






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






12. The oceans






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






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






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






16. Recycle water - oxygen - and phosphorus






17. 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






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






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






20. Animals that eat both plants and animals






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






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






23. Animals that consume primary consumers (carnivores)






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






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






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






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






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






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






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






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






32. Every energy transfer involves a loss of energy and each level of the food chain uses some of the energy it obtains from the food for its own metabolism and loses some additional energy in the form of heat






33. Conserve water actively






34. The study of interactions between organisms and their environment






35. 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






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






37. 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






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






39. 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






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






41. Animals that feed on secondary consumer






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






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






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






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






46. 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






47. 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






48. 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






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






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