Hilum: The Scar on Seed Coat

The scar on the seed coat through which the developing seeds were attached to the fruit is called hilum. It is a small, oval or round scar on the seed coat where the ovule was attached to the ovary wall. The hilum is the point of attachment of the seed to the funicle or the stalk-like structure that connects the seed to the placenta of the fruit. It marks the position where the seed was last attached to the plant.

Importance of Hilum

The hilum is an important structure for the germination of seeds. It is the point of entry for water and nutrients into the seed during germination. The hilum also serves as the point of exit for waste products that are produced during the process of respiration in the seed. The presence of a well-developed hilum is essential for the proper development of the embryo and the formation of a healthy seed.

Characteristics of Hilum

The hilum can vary in size and shape depending on the plant species. It can be circular, oval, or elongated and can be located at different positions on the seed coat. The hilum is often darker in colour than the rest of the seed coat and can be used to identify the seed of a particular plant species.

Conclusion

In conclusion, the scar on the seed coat through which the developing seeds were attached to the fruit is called hilum. It is an important structure for the germination of seeds and can vary in size and shape depending on the plant species. The presence of a well-developed hilum is essential for the proper development of the embryo and the formation of a healthy seed.