Gene that makes some soybean plants resistant to major parasite identified

The video explains the life cycle of soybean cyst nematodes. It begins with larva hatching and infecting soybean roots, followed by feeding and molting into adults. After mating, females lay eggs in a gelatinous mass. New larva hatch and infect roots within the same year. Many eggs remain inside the female, and after her death, her body forms a cyst that protects the eggs. Some eggs can survive for over nine years.

What is the significance of the cyst formed after the female dies?

How long can some eggs survive?