biology seed germinationWatch
I'm not the best at biology but I thought I'd have a quick look on google to see whether I could find some handy sites for here. There weren't many and the ones I have found probably wont be very good but they might help point you in the right direction or give you an idea. The websites are:
http://jrm.library.arizona.edu/data/1969/221/6alen.pdf - Early seedling growth of Italian Ryegrass and Smilo as Affected by nutrition
http://www.leubner.ch/anatomy.html - The Seed Biology Place. The website includes topics on Seed Anatomy, Seed Germination, Dormancy and Afterripening, and Plant Hormones.
http://trc.ucdavis.edu/egsutter/plb1...evelopment.pdf - Seed Development (not comparing several seeds).
Hope they help a bit.