Page 3 - 2.Lesson Notes-Plantae-Gymnosperm,Angiosperm

Structure of a dicot seed

Seedcoat: The protective layer on the outside is very thin but tough. Within the surface
there is a tiny opening called the micropyle, through which water can enter and start the
germination process
Cotyledons: Also know as seed leaves.
• Takes up most of the space within the bean.
• These serve as food storage for the young bean plant until it grows large enough to
support itself.
• Embryo: The embryo is the infant plant made up of two parts: the radicle, or the first
root, and the plumule, or the first leaves.
• When water enters the micropyle, the radicle starts growing and moves down to form
roots
• and the plumule starts growing upwards to form shoot.
• Hilum: The hilum, or scar, on a bean is the site where the bean originally attached to the
fruit of the plant.