Question

The endosperm in angiosperms develops from

• A. Zygote
• B. Secondary nucleus
• C. Chalazal polar nucleus
• D. Microplyer polar nucleus

Answer 1

Answer: (B)

Secondary nucleus

Endosperm is formed when the two sperm nuclei inside a pollen grain reach the interior of an embryo sac or female gametophyte. One sperm nucleus fertilizes the egg, forming a zygote, while the other sperm nucleus usually fuses with the two polar nuclei or the secondary nuclei at the center of the embryo sac, forming a primary endosperm cell (often called as the triple fusion nucleus). The cell created in the process of double fertilization develops into the endosperm.

It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein.