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The seed coat is the visible exterior of the bean seed. The hard surface protects the inside of the bean seed.

Hilum

The hilum, a pale or white dot, can be located on the inside curved section of the bean seed. It's the scar left behind on the bean when it was disconnected from the string-like growth that held it to the inside of the bean pod.

Micropyle

The micropyle is adjacent to the hilum. This small hole lets water into the bean seed to stimulate the germination process.

Cotyledons

The cotyledons can be seen by splitting the bean seed in half. Each of the halves are known as cotyledons and serve as a food source for the germinating bean until the seedling grows energy-producing leaves.

Plumule

The plumule lies against one of the cotyledon halves. This curled-up, worm-like growth is what develops into a full bean plant. During the germination process, the plumule rises up between the two cotyledons. It's tip is known as the epicotyl and looks like a miniature leaf. It's connected to a hypocotyl, which turns into a stem as the bean develops.

Radicle

The radicle lies just below the plumule and develops into the bean plant's root system.

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14y ago

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