How to select healthy seeds.
Take seeds of your choice and put them in a container filled with water. Shake the container and leave it aside. You will observe that while some seeds start floating, others settle at the bottom. Generally, the floating seeds are hollow and light as they are spoilt or eaten by pests, while the healthy seeds are heavy and are healthy. Hence, they sink at the bottom of the container.
This is the method by which you may know the seeds are of good quality or not.