International Seed Testing Association (ISTA) was established in . . . . . . . . at Geneva, Switzerland.

Answer: Option D

International Seed Testing Association (ISTA) was established in 1924 in Geneva, Switzerland.
It is an independent, non-profit organization founded during the 4^th International Seed Testing Congress in 1924.
Its members work to promote uniform methods of evaluating seeds being sold internationally to facilitate the international trading of seeds and contribute to global food security.
ISTA Rules for sampling and testing seed quality, laboratory accreditation, and the promotion of seed science research and test development.