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






2. Deer - fox - woodchuck - and squirrel






3. Receive less rainfall than the temperate forests - have long - cold winters - and are inhabited by single coniferous tree-the spruce -extreme northern parts of Canada and Russia






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






5. Organisms that manufacture their own food






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






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






8. Animals that consume dead animals






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






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






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






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






13. 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






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






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






17. Links between oceans and land






18. 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






19. Jungles characterized by high temperatures and torrential rains -found in Central Africa - Central America - the Amazon basic - and Southeast Asia






20. Determines water holding capacity






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






22. Regiong beneatht he photic zone that receives no light






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






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






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






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






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






28. Affect the type of vegetation that can be supported






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






30. The study of interactions between organisms and their environment






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






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






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






34. Vegetation such as vines and eppiphytes






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






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






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






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






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






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






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






42. 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






43. Include reproduction and protection from predators and destructive weather






44. Adaptations for maintaining their internal osmolarity and conserving water






45. Without a constant input of energy from the sun - an ecosystem would soon run down - as food is transferred from one level of the food chain to the next - a transfer of energy occurs






46. 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






47. Animals that eat both plants and animals






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






49. Symbiotic relationship from which both organisms derive some benefit






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