It takes four scans to fully identify a Seed Bag.
The first scan will only show the name of the plant.
The second scan will show the plant's Tier (which ranges from 1-8) and who "discovered" the plant. For Vanilla Minecraft plants, the discoverer will be Notch. For other plants it will be the nickname of the developer who added it to IndustrialCraft.
The third scan will show the keywords of the plant. Cross Breeding uses keywords to an extent to determine which new plants to grow, however Tier closeness also plays an important role.
The fourth, and final scan, will show the Growth, Gain, and Resistance (GGR) scores for that Seed Bag. The GGR scores are independent for each Seed Bag.
The first three scans don't require much energy, but the fourth scan uses much more and will completely drain an RE Battery. Additional scans will not provide any additional information and will not use any additional energy.