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Question
Explain the structure of a bean seed.
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Solution
Structure of a bean seed:
- Bean seed is kidney-shaped.
- The seed coat consists of an outer hard covering, testa and an inner thin layer, tegmen. Both layers protect the inner parts from germs and injury.
- On the concave side, there is a white, oval scar known as the hilum which represents the mark where the ovule was attached to the wall of the ovary.
- Close to the hilum is an opening known as the micropyle through which air and water enter into the seed.
- It has two thick cotyledons which store food for the growing embryo.
- The embryo contains the radicle- future root and plumule-future shoot.
- Bean seed is kidney-shaped.
- The seed coat consists of an outer hard covering, testa and an inner thin layer, tegmen. Both layers protect the inner parts from germs and injury.
- On the concave side, there is a white, oval scar known as the hilum which represents the mark where the ovule was attached to the wall of the ovary.
- Close to the hilum is an opening known as the micropyle through which air and water enter into the seed.
- It has two thick cotyledons which store food for the growing embryo.
- The embryo contains the radicle- future root and plumule-future shoot.
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