Test your basic knowledge |

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






2. 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






3. Include saprophytic organisms and organisms of decay






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






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






6. Adaptations for maintaining their internal osmolarity and conserving water






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






8. Crawling and sessile organsms






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






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






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






12. 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






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






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






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. Forest floors contain moss and lichens






17. Links between oceans and land






18. Distinct community in a geographic region






19. 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






20. Affect the type of vegetation that can be supported






21. 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






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






23. Animals that consume dead animals






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






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






26. Recycle water - oxygen - and phosphorus






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






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






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






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






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






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






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






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






35. Animals that consume only plants or plant foods






36. The chief disruptive force






37. Determines water holding capacity






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






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






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






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






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






43. The study of interactions between organisms and their environment






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






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






46. 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






47. Determined by the same decisive factors-temperatures and rainfall






48. 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






49. Organisms that manufacture their own food






50. Include reproduction and protection from predators and destructive weather