Question

Double fertilization leading to initiation of endosperm in Angiosperms requires

• A. Fusion of one polar nucleus and second male gamete only
• B. Fusion of two polar nuclei and second male gamete only
• C. Fusion of 4 or more polar nuclei and second male gamete only
• D. All the above type of fusions in different types of angiosperms

Answer 1

The correct option is B Fusion of two polar nuclei and second male gamete only

Double fertilization involves two sperm cells; one fertilizes the egg cell to form the zygote, while the other fuses with the two polar nuclei that form the endosperm.
After fertilization, the fertilized ovule forms the seed while the tissues of the ovary become the fruit.
In the first stage of embryonic development, the zygote divides to form two cells; one will develop into a suspensor, while the other gives rise to a pro-embryo.
In the second stage of embryonic development (in eudicots), the developing embryo has a heart shape due to the presence of cotyledons.
As the embryo grows, it begins to bend as it fills the seed; at this point, the seed is ready for dispersal.
Double fertilization leading to initiation of endosperm in angiosperms requires fusion of two polar nuclei and second male gamete only.

Thus, the correct answer is option B.