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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. The chief disruptive force






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






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






4. 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






5. 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






6. Animals that consume only plants or plant foods






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






8. Freshwater Biomes vs. Saltwater 1: Freshwater is _______________ which results in the passage of water into the cell. Freshwater organisms have homeostatic mechanisms to maintain water balance by the regular removal of the excess water. these include






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






10. Include reproduction and protection from predators and destructive weather






11. Links between oceans and land






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






13. Developed long legs and many are hoofed






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






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






16. 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






17. 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






18. Include saprophytic organisms and organisms of decay






19. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down






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






21. Rock and soil surface






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






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






24. 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






25. More than 70% of earth -plants have little controlling influence in communities -most stable ecosystems; the conditions affecting temperature - amount of available oxygen and cabon dioxide - and amount of suspended or dissolve materials are very stab






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






27. Symbiotic relationship from which both organisms derive some benefit






28. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food






29. Distinct community in a geographic region






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






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






32. Forest floors contain moss and lichens






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






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






35. Deer - fox - woodchuck - and squirrel






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






37. 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






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






39. Animals that eat both plants and animals






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






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






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






43. Adaptations for maintaining their internal osmolarity and conserving water






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






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






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






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






48. The study of interactions between organisms and their environment






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






50. Crawling and sessile organsms