Day 11, 12
Day 11, 12. Around this time the two unifoliate leaves (white arrows) will unfold and start expanding to reveal the terminal apex (yellow arrow) of the bean plant.
Figure 24. Expanding unifoliate leaves. The pair of expanding unifoliate leaves (white arrow) and the terminal apex (yellow arrow) of a red kidney bean plant. Image: M. E. Conley.
If you remove one of the bean plants from the box and wash off the perlite, you see a complete young bean plant.
Figure 25. The young bean plant. The full plant including the roots. Image: E.T. Paparozzi and M. E. Conley.