What does double fertilization in flowering plants involve?

• A. Two eggs being fertilized by one sperm
• B. One sperm fertilizing an egg and another forming the endosperm
• C. A seed developing into two fruits
• D. Fertilization occurring in two different flowers

Answer: (B)

Double fertilization in flowering plants is a unique reproductive process that involves two distinct fertilization events occurring simultaneously. In this process, one sperm cell fertilizes the egg cell, leading to the formation of the zygote, which will develop into the embryo of the seed. The second sperm cell fuses with two polar nuclei present in the female gametophyte to form the triploid endosperm. This endosperm is crucial as it serves as a nutrient source for the developing embryo within the seed.

Thus, the essence of double fertilization lies in its efficiency and dual outcome—producing both the embryo and the nourishing endosperm, setting the stage for successful seed development and eventual germination.