What parts are different between a leaf and a cotyledon (seed leaf)? Observe carefully and compare the two. In order to see small details, it's good to use magnifying glasses and other instruments. Let's devise how to describe the differences.

A point of observation If you find any difference in form, color, or structure, even a small difference, make a note of it for your records. Ask yourself why this difference exists, what might be the reasons for it. Then check your ideas by making more observations or doing experiments.