Practical Exam – Bio 125 Lab

Lab Due November 14, 2012 Practical Exam 1. a. The symbionts (Paramecium) of the termite belong to the kingdom Protista b. Paramecium living in the intestines of termites breaks down the cellulose walls of wood fibers releasing proteins that are absorbed by the termites’ digestive system. Paramecium benefit by having an environment to thrive and they ingest the wood fibers for their own nutrition as well. 2. c. An important ecological effect of diatoms is that when they die they hold onto CO2 trapped inside their silicon skeleton, carrying it to the ocean floor instead of being released into the atmosphere. . Autotrophic 3. Two characteristics that helped identify the euglena were: e. Two flagellas. f. Eyespot. 4. g. The bacteria in the picture labeled #4 is rod-shaped. h. Cyanobacteria are important producers of Nitrogen in marine environments. 5. i. Lactobacillus found in saliva produced lactic acid to cause Snyder’s medium to change color. j. The tube turned yellow after it was exposed to saliva. 6. k. Red algae have phycobilin pigments (phycoerythrin and phycocyanin) that mask the color of the chlorophylls.
Brown algae have xanthophyll pigments that mask the green color of the chlorophyll. Green algae have cholorphylls a and b that give a bright green color. l. All algae have chlorophyll. 7. m. The hyphae of Rhizopus are coenocytic. n. Gametangia (hyphae fuse), plasmogomy occurs, karyogamy occurs forming Zygosporangium, sporangium form and haploid spores are released to germinate and form hyphae. 8. o. The function of gills in basidiomyctes is to produce spores. p. Basidiomycetes contain crosswalls (they are septate). 9. q. Yeast produces CO2, which makes dough rise. .
Yeast ferment alcohol in brewing. 10. s. In mosses, the leafy green structure is the gametophyte. t. Gametophytes are haploid. 11. u. The plant pictured and labeled number 11 has vascular tissue. v. Sori are the sporangia structures found on the undersides of the fronds. 12. w. The cone labeled #12 is a female cone. x. The needle-like leaves of gymnosperms reduce the surface area, and thick cuticle and sunken stomata minimize water loss. 13. y. Body plan (c) shown on blackboard labeled #13 represents an acelomate. z. Hydras and jellies exhibit radial symmetry. 4. {. Eyespots in flatworms like planaria detect light and use them to move away from light sources. |. The concentration of sense organs at the anterior of this organism is cephalization. 15. }. Annelids such as the Earthworm, which was dissected in lab, have closed circulatory systems. ~. The digestive tract is complete because the digestive tract runs from mouth to anus.

16. . The clitellum of the Earthworm is used in sexual reproduction. . Coelom in Earthworms aid in locomotion and function as a hydrostatic skeleton. 17. The function of hemolymph in an organism such as the Grasshopper is to transport nutrients. . Insects have 3 pairs of walking legs. 18. . Crayfish have an open circulatory system. . Male crayfish are generally bigger than females and have bigger claws. Also in male crayfish the two most anterior swimmerets are enlarged and hardened. 19. . The Perch is a vertebrate. . The lateral line organ is used to sense vibrations and pressure differences in water. 20. . The swim bladder in the Perch is used to maintain buoyancy. . Caudal fin is primarily responsible for propelling the fish forward. 1. . The front position of the mouth in the Perch is advantageous because it allows the Perch to eat and take in water as it swims forward. . No, most fish utilize external fertilization to sexually reproduce.
22. . Rat belongs to class Mammalia. . Possess hair made of keratin. 23. . Yes, cephalization is apparent in the rat. . Cephalization is the concentration of sense organs at the anterior of an organism. 24. . Rat has a closed circulatory system. . Most rats utilize internal fertilization during sexual reproduction. 25. In plants the apical meristem can be found at the: . Root tips Shoot tips 26. . The experiment of a Carnation placed into a beaker full of water and red food coloring demonstrated cohesion, adhesion and capillary action (transpiration) of water through the stem. . Xylem is the vascular tissue mainly involved in this process.
27. . The leaves on blackboard labeled #27 are compound. . The leaves are from a dicot because they are arranged in five’s. 28. . The picture on blackboard labeled #29 is a monocot leaf. . The name of the cell at the end of the arrow is a guard cell. 29. . The picture on blackboard labeled #29 is the stem of a dicot. The vascular bundles are arranged in a ring in the cross-section of the stem. 30. . The secondary xylem growth rings of the woody stem can be counted to determine the age of a tree. . In the picture on blackboard labeled #30, the function of the structure at the end of the arrow is active xylem. This allows for water transport in the tree. Extra Credit 31. Two structural hallmarks of organisms classified mollusks are: muscular foot and mantle. 32. . Rhotifer is the smallest animal that has tissues and organs/organs systems. . The majority of these organisms reproduce by parthenogenesis.

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