If you had searched you'd have found many threads on the subjects covering the fact that drive defragmentation is not necessary in Linux. Linux filesystems can become defragmented, but typically you would only run into this if you edit many large files and are running low on space (doing things such as nonlinear video editing) and even in those extreme cases a *nix filesystem will outperform a Windows filesystem (be it FAT or NTFS).
However, there is a defrag program for ext2 filesystems (google for it!) but a way to ensure the filesystem is defragged is to back everything up to another drive (or partition) and then copy everything back.
Or, you could go to your school lab and take a screenshot of defrag there.
Worst case? You can write a quick paper explaining why *nix filesystems are so much more efficient and better-engineered, and educate your professor and classmates on some of the benefits of *nix over Windows.