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IB 1108 L18 Protista

North Dakota State University : NDSU
Uploaded: 2 years ago
Contributor: Heather Dawn Chandler
Category: Biology
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Filename:   IB_1108_L18_Protista.docx (437.98 kB)
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Pre-Lab Questions Hypothesize in what type of environments it would be advantageous for a protist to be autotrophic, heterotrophic, or mixotrophic. Based on the presence whether food is available in the surrounding or not make the protist autotroph, heterotroph or mixotroph. When there is no availability of food near the protist, then such protist adapts themselves and synthesize chlorophyll in it. Such protist photosynthesizes food by utilizing sunlight and carbon dioxide from atmosphere. When there is enough amount of food is present in the surrounding of protist, such protist eats on such food and become heterotroph. When the food is not enough to fulfill the growth of protist, then protist do both photosynthesizes and eat food available and becomes mixotrophic. Many algae are photosynthetic, like plants. Why then are they not classified as such? The main reason is that they contain chloroplasts and produce food through photosynthesis. However, they lack many other structures of true plants. For example, algae do not have roots, stems, or leaves. Some protists are colony forming. Hypothesize why this may be an advantage or disadvantage. Protists which live together forming a large multicellular colony of many individuals belonging to same species are called colonial protists. The best advantage is division of labor as they work together. Cooperativity makes them better survivor and according to Darwin's theory nature always select the better survivors. Due to cooperativity fitness level also increase and if any deleterious mutation comes opportunity to survive also increases as power to conflict between levels are high in colony rather than single individual. Experiment 1: Viewing Preserved Species of Protists Post-Lab Questions Draw each organism from Figures 6 and 7 in the space provided below and label the major structures. Cytoplasm ant. convacuole nucleolus cilia 3076575-691515409575-510540 nucleus gullet stigma pellicle nucleus flagellum (Euglena) contractile vacuole (Paramecium) 21891088160Answer the following questions: What type of locomotion do you think each protist employs? Figure 6: Euglena moves with help of flagellum by generation of waves. Figure 7: Paramecium moves with help of cilia. What advantage do you think a protist would gain by having a unicellular, filamentous, or colonial form? A protist is always unicellular so no added benefits for that. If it is filamentous the protist can gain motility or access to fresher media (by agitating the media when adhered to a surface) hence greater access to nutrients. And in case of colonial form there is possibility for rudimentary communication (like quorum sensing) which allows benefits of community, for example the protist community can examine the danger beforehand and respond to it better. Experiment 2: Viewing Live Specimens Post-Lab Questions In the space provided below, draw the various members of the protist kingdom that you were able to observe. Next to each drawing, describe the speed and type of locomotion you observed. Did you notice a difference in the protists when the slowing agent was used? Which members were you able to see more clearly? The live protist specimen video on the eScience Labs’ Student Portal, clearly showing when the slowing agent yeast was added, the movement of paramecium became slower and protest tried to change its size and shape and it has reduced its size also. Were there species that were still moving too fast to see clearly? The yeast was completely fed by paramecium. Both the species are visible clearly from the first and second videos Could you identify any species specifically? Due to size and abundance, the paramecium was visible clearly Do any of them look similar to specimens you observed in the first lab? Yes, the paramecium looked the same.

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