Question

The endosperm of angiosperms results after fertilization from?

• A. Zygote
• B. Antipodal cells
• C. Secondary nucleus
• D. Synergids

Answer 1

The correct option is C

Secondary nucleus

The correct option is C.

An explanation for the correct option:

1. The diploid secondary nucleus of angiosperms produces endosperm after fertilization. A triploid primary endosperm nucleus is formed when a haploid male gamete fuses with a diploid secondary nucleus.
2. When three nuclei (two polar nuclei and one male gamete) fuse together, this is known as triple fusion. When the other male gamete fuses with the egg nucleus, a diploid zygote is formed. When two types of fusion occur, double fertilization occurs.

An explanation for the incorrect options:

Option A:

1. When a pollen grain containing two sperm reaches the stigma of a flower's female structures, it enters the ovary. A diploid zygote is formed when one sperm fertilizes one egg. The other sperm fuses with the polar nuclei to form endosperm, which feeds the developing zygote.

Option B:

1. An antipodal cell is any of three haploid cells found at the end of the embryo sac farthest from the micropyle in most angiosperms.

Option D:

1. Synergid cells are two specialized cells found in angiosperm female gametophytes adjacent to the egg cell that play an important role in pollen tube guidance and function.

Final answer: Endosperm is formed following the fertilization of a haploid male gamete with a diploid secondary nucleus.