The angiospermic endosperm, except in special cases, is a triploid (3n) tissue as it is a product of triple fusion involving double fertilization. It is, thus, distinct from the endosperm of gymnosperms and heterosporous pteridophytes where the endosperm is a ……….
(A) Diploid before fertilization.
(B) Simple haploid (n) tissue of the gametophyte not involving any complication like polar fusion or fertilization.
(C) Polyploid formed after simple fertilization.
(D) Haploid formed after fertilization.
In gymnosperms, the endosperm is haploid in nature. Whereas, in angiosperms there is a characteristic double fertilization, where a triploid endosperm as well as a diploid zygote is formed. In angiosperms, a diploid polar secondary nuclei fuses with male gamete forming triploid endosperm, serves the role of providing nourishment to the developing embryo.
So, the correct answer is option (B).