Structure of a seed:
1. Seed is a reproductive unit that developed from fertilized mature ovule.
2. The seed is made up of seed coat, embryo with or without endosperm and one or two cotyledons.
3. Outer most covering of a seed is called seed coat.
4. It shows outer layer called as testa and inner layer called as tegmen.
5. Hilum is a scar on the seed coat through which seed attach to the fruit.
6. Embryo of a seed is enclosed within seed coat.
7. Embryonal axis consists of radicle and plumule.
8. The part of embryonal axis between cotyledon and plumule is epicotyl, while the part between cotyledons and radicle is hypocotyl.
9. The nutritive tissue in a seed called endosperm.
[Note: Dicotyledonous seed is a nonendospermic or exalbuminous, as it lacks endosperm at maturity.] [Note: Students can scan the given Q.R code to study the structure of dicotyledonous and monocotyledonous seed.]
