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






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






3. Determines water holding capacity






4. Organisms that manufacture their own food






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






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






7. Animals that consume green plants (herbivores)






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






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






10. 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






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






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






13. Algae - crabs - crustacea - and many different species of fish






14. 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






15. 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






16. 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






17. Include saprophytic organisms and organisms of decay






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






19. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place






20. Conserve water actively






21. Animals that eat both plants and animals






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






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






24. Animals that consume dead animals






25. The nitrogen locked up in the wastes and dead tissues is released by the action of the bacteria of decay - which convert the proteins into ammonia






26. Because organisms at the upper levels of the food chain derive their food energy from organisms at lower levels - and because energy is lost from one level to the next - each level can support a successively smaller biomass






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






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






29. Crawling and sessile organsms






30. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying






31. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds






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






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






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






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






36. Animals that consume primary consumers (carnivores)






37. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes






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






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






40. 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






41. Includes climate - temperature - availability of light and water - and the local topology






42. Only animal life and other heterotrophic life exists






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






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






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. The study of interactions between organisms and their environment






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






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






49. Includes the community and the environment and usually all five kingdoms






50. The ultimate source of energy for all organisms