Pusa 1121 is essentially a derived variety, evolved through the process of hybridization over a long breeding process. The variety of basmati rice was developed by Padma Shri awardee Devesh Mittal and his brother Aman Mittal. This variety of rice is known for its extraordinary kernel (grain) length, which can be as much as 8.4 millimetres (0.33 in) for a single grain, the longest-ever known released cultivar in the world. It has very high kernel elongation ratio ranging from 2 to 2.5, i.e. length of cooked rice kernel/length of uncooked kernel. When cooked, the rice does not turn sticky, and hence has a lower glycemic index than most rice varieties, possesses minimum breadth-wise expansion, and is aromatic with intermediate alkali-spreading value and amylose content.

Read more about in Wikipedia.