Concept:Endospermous seeds retain endosperm, the food storage tissue, at maturity.Explanation:In maize grain, the endosperm is present and forms the main food reserve. This makes it an endospermous seed.Cashew nut, cotton seed, and bean seed are exalbuminous or non-endospermous because the endosperm is absorbed and food is stored in the cotyledons.Answer:A. maize grain