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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. Determined by the same decisive factors-temperatures and rainfall






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






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






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






5. 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






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






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






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






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






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






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






12. Recycle water - oxygen - and phosphorus






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






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






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






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






17. 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






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






19. Links between oceans and land






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






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






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






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






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






25. When one organism is benefited by the association and the other is not affected






26. Animals that consume only plants or plant foods






27. Deer - fox - woodchuck - and squirrel






28. Conserve water actively






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






30. Animals that feed on secondary consumer






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






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






33. Rivers - lakes - ponds - and marshes






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






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






36. Distinct community in a geographic region






37. The study of interactions between organisms and their environment






38. Freshwater Biomes vs. Saltwater 2: In rivers and streams - strong swift currents exist - and thus fish that have developed strong muscles and plants with _____________ have survived






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






40. 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






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






42. 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






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






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






45. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem






46. Animals that consume green plants (herbivores)






47. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition






48. Determines water holding capacity






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






50. The chief disruptive force