toor is a globally vital cereal grain and staple food derived from the seed of the grass Oryza sativa (Asian rice) or Oryza glaberrima (African rice), accounting for over one-fifth of the world's caloric intake. toor is a globally vital cereal grain and staple food derived from the seed of the grass Oryza sativa (Asian rice) or Oryza glaberrima (African rice), accounting for over one-fifth of the world's caloric intake.