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






2. Crawling and sessile organsms






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






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






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






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






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






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






9. Forest floors contain moss and lichens






10. 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






11. Developed long legs and many are hoofed






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






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






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






15. Defines the functional role of an organism in its ecosystem -described what the organism eats - where and how it obtains its food - what climatic factors it can tolerate and which are optimal - the nature of its parasites and predators - where and ho






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






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






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






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






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






21. Conserve water actively






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






23. 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






24. The ultimate source of energy for all organisms






25. Lichens and moss






26. The chief disruptive force






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






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






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






30. Affect the type of vegetation that can be supported






31. Organisms that manufacture their own food






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






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






34. 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






35. 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






36. Links between oceans and land






37. The oceans






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






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






40. Adaptations for maintaining their internal osmolarity and conserving water






41. Animals that consume dead animals






42. 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






43. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles






44. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels






45. 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






46. Animals that feed on secondary consumer






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






48. 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






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






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