Endosperm development precedes embryo development because the endosperm provides essential nutrients and support for the growing embryo. After fertilization, the endosperm forms from the fusion of a male gamete with two polar nuclei in the central cell of the ovule. The endosperm serves as a nutritive tissue, supplying the developing embryo with carbohydrates, proteins, and other nutrients necessary for growth and development. Once the endosperm is established and functional, embryo development begins, utilizing the nutrients provided by the endosperm for its growth and differentiation. Therefore, endosperm development precedes embryo development to ensure proper nourishment and support for the developing embryo.
