Activity #4: Experimental Design

Materials:  foldscope kits, red onion, plastic droppers 

Part 1: Carefully view the below video to learn how to view red onion cells under your foldscope. Note, the video uses an actual microscope instead of a foldscope so you will neecd to adjust accordingly. 

Part 2: Using the information in the above video above, and in Unit 2, design and conduct a proper experiment to answer the question below.  Document your experiment in your workbook. 


What effect does the addition of salt and freshwater have on red onion cell appearance?