Multiple choice Which is not a cereal or grain crop? Rice Mustard Maize Oat Reveal answer Fill a bubble to check yourself B Correct answer Explanation Mustard is an oilseed crop, not a cereal or grain crop. Rice, maize, and oat are all cereal grains (cereals belong to the grass family Poaceae), while mustard belongs to the Brassicaceae family and is cultivated for its seeds used in oil production.