Explain the diagram of the longitudinal section of a maize seed.

(N/A) $\rightarrow$ Generally,monocotyledonous seeds are endospermic,but some,as in orchids,are non-endospermic.
$\rightarrow$ In the seeds of cereals such as maize,the seed coat is membranous and generally fused with the fruit wall.
$\rightarrow$ The endosperm is bulky and stores food.
$\rightarrow$ The outer covering of the endosperm separates the embryo by a proteinous layer called the aleurone layer. It is made up of square or rectangular cells,and protein granules are stored in its cells.
$\rightarrow$ The embryo is small and situated in a groove at one end of the endosperm. It consists of one large and shield-shaped cotyledon known as the scutellum and a short axis with a plumule and a radicle.
$\rightarrow$ The plumule and radicle are enclosed in sheaths which are called the coleoptile and coleorhiza,respectively.