Schematically explain the formation of an embryo in an albuminous monocotyledonous seed.
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Answer:
Corn, wheat and rice, are examples of monocot seeds or monocotyledons.
Embryos of a monocotyledonous seed possess only one large cotyledon called scutellum. The scutellum is generally shield-shaped and is located laterally towards a side of the embryo axis. As in dicotyledons, the embryo axis of monocotyledons possesses a shoot tip, plumule, enclosed in a sheath called coleoptile and a root tip, radicle, enclosed in coleorhiza. In a monocotyledonous seed, the endosperm is covered by a proteinous layer called aleurone layer.
The majority of the monocotyledonous seeds are albuminous seeds, i.e., they have thick, swollen endosperms for nourishment. The endosperm is not completely consumed during embryo development, and it is the nourishing tissues in seeds. However, some monocotyledons like orchids show exceptions.
Other monocot seeds examples include ginger, banana, sorghum, onion, coconut and garlic.