A triploid proteinaceous layer, which is the outer covering of endosperm is present in the seeds of

The triploid proteinaceous layer, which is the outer covering of endosperm, is present in the seeds of gymnosperms and angiosperms. This layer is known as the aleurone layer. It is particularly prominent in the seeds of monocotyledonous plants, such as corn and wheat. The aleurone layer serves as a source of protein for the developing embryo and can also produce enzymes that help in the digestion of starch in the endosperm.