Intro: The kingdom Protista is a diverse group that includes more than 200,000 species. Protists are animals that are not plants, animals, fungus




Дата канвертавання21.04.2016
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Plant-like Protist Lab
Intro: The kingdom Protista is a diverse group that includes more than 200,000 species. Protists are animals that are not plants, animals, fungus, or prokaryotes. Today you will use the microscope to observe and draw several different kinds of plant-like protists. It may be hard to view these organisms under the microscope—be patient!
1. Make a wet mount of the protist, Volvox. Take care not to press down on the cover slip, or you will squish the organisms. Volvox is a large colonial flagellate, a kind of green algae. This green alga is common in lakes and ponds. Each individual cell consists of two flagella. Draw 1 or 2 Volvox in the box.


  1. Why are the Volvox green?


  1. Why do the volvox have 2 flagella?



  1. The Volvox has an eyespot at its anterior end. What do you think the eyespot is for?



  1. Make a wet mount of the protist, Closterium. Take care not to press down on the cover slip, or you will squish the organisms. Closterium is a crescent shaped protist that lives in cool freshwater. Closterium reproduce by conjugation. Draw 1 or 2 organisms in the box below.


  1. In the above paragraph, it states that Closterium reproduce by conjugation. What does this mean?


  1. Closterium sometime form algal blooms. What is an algal bloom? Use your book to find the answer.


  1. Make a wet mount of the protist, Hydrodictyon. Take care not to press down on the cover slip, or you will squish the organisms. Hydrodictyon is one of the most interesting algaes. It is called the “water net.” Draw Hydrodictyon in the box.




  1. Why is Hydrodictyon called the “water net?”


  1. Hydrodictyon has a tendency to reproduce too fast. Why would Hydrodictyon reproducing too fast be a problem?



  1. Make a wet mount of the protist, Pediastrum. Take care not to press down on the cover slip, or you will squish the organisms. Pediastrum is a genus of green algae found in freshwater. Large colonies of Pediastrum look like green slime. Draw a few Pediastrum in the box below.




  1. The name “Pediastrum” means plain star. Why is Pediastrum named plain star?



  1. How do green algae reproduce? Sexually, asexually, or both?




  1. Make a wet mount of the protist, Spirogyra. Take care not to press down on the cover slip, or you will squish the organisms. Spirogyra are another species of green freshwater algae. They too look like green scum on a pond when large enough colonies are present. Spirogyra get their name for the chloroplast that is wound in a spiral. Draw an example of Spirogyra in the box below.




  1. Why would spirogyra come to the surface of the pond they inhabit?



  1. Green algae in general inhabit eutrophic waters? What does eutrophic mean, and what does it tell us about the water?





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