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






3. Affect the type of vegetation that can be supported






4. Organisms that manufacture their own food






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






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






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






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






9. Food chain is not a simple linear chain but an intricate web






10. 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






11. Deer - fox - woodchuck - and squirrel






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






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






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






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






16. Symbiotic relationship from which both organisms derive some benefit






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






18. 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






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






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






21. 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






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






23. 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






24. Recycle water - oxygen - and phosphorus






25. Distinct community in a geographic region






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






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






28. Forest floors contain moss and lichens






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






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






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






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






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






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






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






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






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






38. Crawling and sessile organsms






39. Treeless - frozen plain found between the taiga lands and the northern ice sheets - very short summer and thus a very short growing season during which time the ground becomes wet and marshy






40. Characterized by low rainfall - although considerably more than the desert biomes receive -provide no shelter for herbivorous mammals from carnivorous predators -ex: East of the Rockies - steppes of the Ukraine - and the pampas of Argentina






41. Links between oceans and land






42. Animals that feed on secondary consumer






43. 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






44. The chief disruptive force






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






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






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






48. Freshwater Biomes vs. Saltwater 3: Freshwater biomes - except very large lakes - are affected by variations in _________. temperature of freshwater bodies varies considerably; they may freeze or dry up - and mud from their floors may be stirred up by






49. 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






50. First to resettle a virgin area







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