IB 1108 L18 Protista

Pre-Lab Questions Hypothesize in what type of environments it would be advantageous for a protist to be autotrophic, heterotrophic, or mixotrophic. If an autotrophic protist is in an environment with lots of sunlight, CO2 and water then the protist would be able to survive. For a heterotrophic protist to be able to thrive there needs to be lots of prey and very little to no sunlight. For a mixotrophic protist to survive there needs both lots of sunlight, CO2, water a pre. Many algae are photosynthetic, like plants. Why then are they not classified as such? They are not classified as plants because they lack many plant structures like roots, stems or leaves. However, they are similar since they have chloroplast and create their own food. Some protists are colony forming. Hypothesize why this may be an advantage or disadvantage. An advantage would be that they are able to survive more as they work together as a multicellular organism. 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. Answer the following questions: What type of locomotion do you think each protist employs? Figure 6: Moves with the help of flagellum. (Euglena) Figure 7: Moved with the help of Cilia. (Paramecium) What advantage do you think a protist would gain by having a unicellular, filamentous, or colonial form? - there are no advantages from being unicellular. An advantage for having a filamentous would be that the protist would have mobility and can access more nutrients. And the advantage for having a colonial form is that the protist with be able to know danger before it comes. 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? Were there species that were still moving too fast to see clearly? Could you identify any species specifically? Do any of them look similar to specimens you observed in the first lab? The live video shows when the slowing agent yeast was added. It also shows how the movement of paramecium became slower and how the protest tried to change its size and shape and it has reduced its size also. Both the species were visible in both videos. I was able to recognize the Paramecium more because of its size. The paramecium looked the same.