Stored tamarind seeds were infected with some kind of internal feeding pest. It was recognized by the white eggs on the seed surface and the round exit holes on seed coat.
Fig: Eggs on the surface of tamarind seeds
Then eggs were observed under foldscope using a paper slide. It was oval in shape with an external layer or egg shell called chorion. There was a tunnel like opening at the sharper end called as respiratory tube for gaesous exchange.
Fig: Tamarind pest eggs viewed under foldscope