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Bio Lab Wksht & HW Questions 12

Bio Lab Wksht & HW Questions 12 - free to consult...

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7 3. Are the wings of birds and insects homologous or analogous? Explain. 4. The common ancestor of all the tetrapod vertebrates had four limbs with a similar skeletal structure to that seen in many vertebrates today. Considering this, in what sense are the arms of humans homologous to the wings of a bird? 5. The green algal ancestors of plants existed in aquatic habitats, contained chlorophyll a and b, and had cell walls composed mainly of cellulose. Land plants also contain chlorophyll a and b and have cell walls of cellulose. What traits in the land plants are primitive? What trait represents divergent evolution from the ancestral form? C. Looking at the world in a drop of water: Microscopy Throughout Bio 1020 labs, you will be using both dissecting and compound light microscopy to view minute details of specimens. Appendix I at the end of your lab manual details the use of both types of scopes. Your lab instructor will lead you through the setup and use of the microscopes during today’s lab, but you should feel
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Unformatted text preview: free to consult the Appendix at any time during the term. Use a Pasteur pipette and bulb to remove a drop of pond water from the aquarium on the side bench. • Try to include tiny bits of plant and algal material. • Prepare a slide for viewing under the compound scope by making a spiral of Vaseline on the slide and putting your drop of water inside the spiral. Add a cover slip and take it to your scope at your bench. • Examine the slide’s contents carefully, watching for movement of microscopic organisms, or for green colouration, or any other evidence of structures. • Try again if unsuccessful the first (or second, or third) time. • Several pond water guides are available in the classroom to help you identify your catch! • Sketch what you see and suggest a possible identity of your organism in the space below....
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