Some angiosperm seeds are said to be albminous,whereas few others are said to have a perisperm.Explain each with the help of an example

Albuminous seeds retain a part of endosperm as it is not competely used up during embryo development e.g., wheat,barley,castor,sunflower. When rennants of nucellus are persistant it is said to have a perisperm. Example:black pepper,beat.