Bean Seed Parts

Bean seeds are known as dicotyledons because they can be split into two halves, unlike monocotyledons like corn or wheat. Due to the bean seed's relatively large size and quick germination process, it's ideal for those who want to study the different parts of a seed. School teachers often use bean seeds to teach the seed growth process to grade school students, but people of all ages can inspect a bean seed and see what parts play a role in the future plant's growth.

Seed Coat

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.

Keywords: bean seed parts, bean seed components, parts of a bean seed

About this Author

Josh Duvauchelle is an editor and journalist with more than 10 years' experience. His work has appeared in various magazines, including "Honolulu Magazine," which has more paid subscribers than any other magazine in Hawaii. He graduated with honors from Trinity Western University, holding a Bachelor of Arts in professional communications, and earned a certificate in applied leadership and public affairs from the Laurentian Leadership Centre.