Day 16 Yesterday, we observed paramecia under microscopes. How did they compare to the Elodea leaf? Elodea leaf Paramecium 1

Visualization Exercise 3.4 Color Visualization Exercise 3.4 2

Look at page 24 in your resources book Procedure: During the discussion of the students’ findings, the teacher should discuss the Congo red-dyed yeast turning blue inside the paramecium. Ask: “If you were to draw the paramecium in color, what color would you draw it?” [Some might say no color, some may suggest red (because of the Congo red-dyed yeast), and some may suggest blue (because of the Congo red-dyed yeast turning blue inside the paramecium). The teacher should reinforce the concept that the paramecium is neither red nor blue; these colors result from adding the Congo red-dye, and are not part of the paramecium itself.] Ask: If another artist chose to color the paramecium blue, what would you be able to tell about the inside of a paramecium? [Students might say that this would mean that the paramecium must have an acidic interior] Explain: “Because they used Congo red-dye, which is an acid indicator, blue shows there is acid. However, this does not guarantee that the artist is trying to tell the reader this fact. Other images may also use the color blue and it may mean something completely different. Whenever you see color in a diagram it is your job to ask yourself why the artist chose that color. Did they do it just to make the diagram attractive, or did they do it to help you understand something important. Explain: “Red and blue are very common colors used for dyes, and therefore many microscopic images will use red and blue to show the cells’ internal structure. Without a dye, these things are very hard to see.” >>>end of exercise<<< 3

Visualization Exercise 3.5 Labels Visualization Exercise 3.5 4

Look at page 24 in your Resources Book 5

Visualization Exercise 3.6 Color Visualization Exercise 3.6 6

Look at pages 24–26 in your Resources Book Activity Title 7